HD 166006: Difference between revisions

HD 166006
Observation data; Epoch J2000 Equinox J2000
Constellation	Telescopium
Right ascension	18h 11m 04.40s
Declination	−47° 30′ 47.24″
Apparent magnitude (V)	6.07±0.01
Characteristics
Spectral type	K1 III CN2
B−V color index	+1.20
Astrometry
Radial velocity (Rv)	−14.9±2.9 km/s
Proper motion (μ)	RA: −3.69±0.39 mas/yr ; Dec.: −29.50±0.23 mas/yr
Parallax (π)	5.6048 ± 0.0652 mas
Distance	582 ± 7 ly ; (178 ± 2 pc)
Absolute magnitude (MV)	−0.12
Details
Mass	1.24 M☉
Radius	20.1 R☉
Luminosity	165 L☉
Surface gravity (log g)	1.89 cgs
Temperature	4,529±93 K
Metallicity [Fe/H]	−0.07 dex
Rotational velocity (v sin i)	<1 km/s
Other designations
	CD−47 12098, HD 166006, HIP 89096, HR 6778, WDS J18111-4731A
Database references
SIMBAD	data

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HD 166006, also known as HR 6778, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.07, making it barely visible to the naked eye. Based on Gaia DR2 parallax measurements, the object is located 582 light years away. It is currently approaching the Solar System with a somewhat constrained heliocentric radial velocity of −15 km/s.

HD 166006 has a stellar classification of K1 III CN2,^[3] which indicates that it is an evolved red giant with a strong overabundance of cyano radicals in its spectrum, making it a CN star. At the estimated distance of HD 166006, the star has an angular diameter of 1.05 mas.^[10] This yields a radius of 20.1 R_☉.^[9] It has 1.24 times the mass of the Sun^[8] and radiates 165 times the luminosity of the Sun^[7] from its enlarged photosphere at an effective temperature of 4,529 K.^[10] The star is slightly metal deficient ([Fe/H] = −0.07^[8]) and spins a little too slowly to be accurately measured.^[11]HD 166006 has an optical 11th magnitude companion located 1.8" away along a position angle of 271° as of 2015.^[13]

References

^ ^a ^b ^c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
^ ^a ^b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −53° to −40°. Bibcode:1978mcts.book.....H.
^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
^ van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Hipparcos record for this source at VizieR.
^ ^a ^b ^c Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
^ ^a ^b ^c ^d ^e Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" (PDF). Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
^ ^a ^b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(178\cdot 1.05\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 40.2\cdot R_{\bigodot }\end{aligned}}$
^ ^a ^b ^c Stevens, Daniel J.; Stassun, Keivan G.; Gaudi, B. Scott (1 December 2017). "Empirical Bolometric Fluxes and Angular Diameters of 1.6 Million Tycho-2 Stars and Radii of 350,000 Stars with Gaia DR1 Parallaxes". The Astronomical Journal. 154 (6): 259. arXiv:1708.05025. Bibcode:2017AJ....154..259S. doi:10.3847/1538-3881/aa957b. ISSN 0004-6256. S2CID 119191064.{{cite journal}}: CS1 maint: unflagged free DOI (link)
^ ^a ^b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (1 January 2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. S2CID 54046583.
^ "HR 6778". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 September 2021.
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (1 December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.

[GaiaDR2-1] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Tycho2000-2] Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[Houk1978-3] Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −53° to −40°. Bibcode:1978mcts.book.....H.

[Johnson1966-4] Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.

[Gontcharov2006-5] Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.

[VanLeeuwen2007-6] van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Hipparcos record for this source at VizieR.

[XHIP-7] Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.

[Anders2019-8] Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" (PDF). Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.

[Lang2006-9] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(178\cdot 1.05\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 40.2\cdot R_{\bigodot }\end{aligned}}$

[Stevens2017-10] Stevens, Daniel J.; Stassun, Keivan G.; Gaudi, B. Scott (1 December 2017). "Empirical Bolometric Fluxes and Angular Diameters of 1.6 Million Tycho-2 Stars and Radii of 350,000 Stars with Gaia DR1 Parallaxes". The Astronomical Journal. 154 (6): 259. arXiv:1708.05025. Bibcode:2017AJ....154..259S. doi:10.3847/1538-3881/aa957b. ISSN 0004-6256. S2CID 119191064.{{cite journal}}: CS1 maint: unflagged free DOI (link)

[DeMederios2014-11] De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (1 January 2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. S2CID 54046583.

[Simbad-12] "HR 6778". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 September 2021.

[Mason2001-13] Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (1 December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.

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@@ Line 5: / Line 5: @@
 {{Starbox observe
  | epoch = J2000
- |constell = [[Telescopium]]
+ | constell = [[Telescopium]]
  | ra = {{RA|18|11|04.40}}<ref name = GaiaDR2/>
- |dec = {{DEC|-47|30|47.24}}<ref name = GaiaDR2/>
+ | dec = {{DEC|-47|30|47.24}}<ref name = GaiaDR2/>
- |appmag_v = {{val|6.07|0.01}}<ref name = Tycho2000/>
+ | appmag_v = 6.07{{±|0.01}}<ref name = Tycho2000/>
 }}
 {{Starbox character
- | class = K1 III CNII<ref name = Houk1978/>
+ | class = K1 III CN2<ref name = Houk1978/>
- | b-v = +1.18<ref name = Mermilliod1987/>
+ | b-v = +1.20<ref name = Johnson1966/>
- | u-b = +1.15<ref name = Mermilliod1987/>
 }}
 {{Starbox astrometry
- | absmag_v = −0.12<ref name = XHIP/>
+ | radial_v = −14.9{{±|2.9}}<ref name = Gontcharov2006/>
- | radial_v = {{val|-16.51|0.14}}<ref name = GaiaDR2/>
  | parallax = 5.6048
  | parallax_footnote= <ref name = GaiaDR2/>
@@ Line 24: / Line 22: @@
  | prop_mo_dec = {{val|-29.50|0.23}}
  | pm_footnote = <ref name = VanLeeuwen2007/>
+ | absmag_v = −0.12<ref name = XHIP/>
 }}
 {{Starbox detail
  | mass = 1.24<ref name = Anders2019/>
  | temperature = {{val|4529|93|fmt=commas}}<ref name = Stevens2017/>
- | radius = 20.1<ref name = Stevens2017/><ref name = Lang2006/>
+ | radius = 20.1<ref name = Lang2006/>
  | luminosity = 165<ref name = XHIP/>
  | gravity = 1.89<ref name = Anders2019/>
@@ Line 42: / Line 41: @@
 {{Starbox end}}
-'''HD 166006 (HR 6778)''' is a double star in the southern constellation [[Telescopium]]. With an [[apparent magnitude]] of around 6, it is barely visible to the [[naked eye]] under ideal conditions. The star is located {{Convert|582|ly|pc|abbr=off|lk=on}} based on [[parallax]], but is drifting closer with a heliocentric [[radial velocity]] of 16.5 km/s.
+'''HD 166006''', also known as '''HR 6778''', is a solitary orange-hued [[star]] located in the southern [[constellation]] [[Telescopium]]. It has an [[apparent magnitude]] of 6.07, making it barely visible to the [[naked eye]]. Based on [[Gaia DR2]] [[parallax]] measurements, the object is located 582 [[light year]]s away. It is currently approaching the [[Solar System]] with a somewhat constrained heliocentric [[radial velocity]] of {{val|−15|ul=km/s}}.
+HD 166006 has a [[stellar classification]] of K1 III CN2,<ref name = Houk1978/> which indicates that it is an evolved [[red giant]] with a strong overabundance of [[cyano radical]]s in its spectrum, making it a [[CN star]]. At the estimated distance of HD 166006, the [[star]] has an [[angular diameter]] of {{val|1.05|ul=mas}}.<ref name = Stevens2017/> This yields a [[radius]] of {{solar radius|20.1}}.<ref name = Lang2006/> It has 1.24 times the [[mass of the Sun]]<ref name = Anders2019/> and radiates 165 times the [[luminosity of the Sun]]<ref name = XHIP/> from its enlarged [[photosphere]] at an [[effective temperature]] of 4,529 [[Kelvin|K]].<ref name = Stevens2017/>  The star is slightly metal deficient ([Fe/H] = −0.07<ref name = Anders2019/>) and spins a little too slowly to be accurately measured.<ref name = DeMederios2014/>HD 166006 has an [[optical]] 11th [[magnitude (astronomy)|magnitude]] companion located 1.8" away along a [[position angle]] of 271° as of 2015.<ref name = Mason2001/>
-==Properties==
-HD 166006 has a [[stellar classification]] of K1 III CNII, which states it is a K-type star that has exhausted [[hydrogen]] at its core and left the [[main sequence]]. The "CNII" states it has a strong overabundance of [[cyano radical]] in its atmosphere. It has 1.24 times the [[Sun's mass]], but has expanded to almost 19 times the [[Sun's radius]]. It radiates at 165 [[Solar luminosity|solar luminosities]] from its enlarged [[photosphere]] at an [[effective temperature]] of 4,529 [[Kelvin|K]]. As of 2015,  HD 166006 has an 11th magnitude companion separated 1.8 arcseconds away. However, the companion is unrelated to HD 166006.<ref name = Mason2001/>
 ==References==
@@ Line 52: / Line 50: @@
 <ref name = GaiaDR2>{{Cite DR2|6707446410383995648}}</ref>
-<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=1 March 2000 |volume=355 |pages=L27–L30 |bibcode=2000A&A...355L..27H |issn=0004-6361}}</ref>
+<ref name = Tycho2000>{{cite journal | last1 = Høg | first1 = E. | last2 = Fabricius | first2 = C. | last3 = Makarov | first3 = V. V. | last4 = Urban | first4 = S. | last5 = Corbin | first5 = T. | last6 = Wycoff | first6 = G. | last7 = Bastian | first7 = U. | last8 = Schwekendiek | first8 = P. | last9 = Wicenec | first9 = A. | title = The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics | date = March 2000 | volume = 355 | pages = L27–L30 | bibcode = 2000A&A...355L..27H | issn = 0004-6361}}</ref>
-<ref name = Houk1978>{{cite book |last1=Houk |first1=Nancy |title=Michigan catalogue of two-dimensional spectral types for the HD stars |location=Ann Arbor |publisher=Deptartment of Astronomy, University of Michigan  |date=1978 |bibcode=1978mcts.book.....H}}</ref>
+<ref name = Houk1978>{{cite book |last1=Houk |first1=Nancy |title=Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −53° to −40° |year=1978 |bibcode=1978mcts.book.....H }}</ref>
-<ref name = Mermilliod1987>{{cite journal |last1=Mermilliod |first1=J.-C. |title=UBV photoelectric photometry catalogue (1986). I - The original data (magnetic tape) |journal=Astronomy and Astrophysics Supplement Series |date=1 December 1987 |volume=71 |pages=413–420 |bibcode=1987A&AS...71..413M |issn=0365-0138}}</ref>
 <ref name = XHIP>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=1 May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |arxiv=1108.4971 |bibcode=2012AstL...38..331A|s2cid=119257644 |issn=1063-7737}}</ref>
+<ref name = VanLeeuwen2007>{{cite New HIP red.|89096}}</ref>
-<ref name = VanLeeuwen2007>{{cite journal |last1=van Leeuwen |first1=F. |title=Validation of the new Hipparcos reduction |journal=Astronomy and Astrophysics |date=1 November 2007 |volume=474 |issue=2 |pages=653–664 |doi=10.1051/0004-6361:20078357 |bibcode=2007A&A...474..653V |s2cid=18759600 |issn=0004-6361|arxiv=0708.1752 }}</ref>
 <ref name = Stevens2017>{{cite journal |last1=Stevens |first1=Daniel J. |last2=Stassun |first2=Keivan G. |last3=Gaudi |first3=B. Scott |title=Empirical Bolometric Fluxes and Angular Diameters of 1.6 Million Tycho-2 Stars and Radii of 350,000 Stars with Gaia DR1 Parallaxes |journal=The Astronomical Journal |date=1 December 2017 |volume=154 |issue=6 |pages=259 |doi=10.3847/1538-3881/aa957b |arxiv=1708.05025 |bibcode=2017AJ....154..259S|s2cid=119191064 |issn=0004-6256}}</ref>
@@ Line 77: / Line 73: @@
  & \approx 40.2\cdot R_{\bigodot}
 \end{align}</math></ref>
+<ref name = Gontcharov2006>{{cite journal | last1 = Gontcharov | first1 = G. A. | title = Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system | journal = Astronomy Letters | date = November 2006 | volume = 32 | issue = 11 | pages = 759–771 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773706110065 | pmid = | bibcode = 2006AstL...32..759G | arxiv = 1606.08053 | s2cid = 119231169 }}</ref>
+<ref name = Johnson1966>{{cite journal | last1 = Johnson | first1 = H. L. | last2 = Mitchell | first2 = R. I. | last3 = Iriarte | first3 = B. | last4 = Wisniewski | first4 = W. Z. | title = UBVRIJKL Photometry of the Bright Stars | journal = Communications of the Lunar and Planetary Laboratory | year = 1966 | volume = 4 | pages = 99–110 | bibcode = 1966CoLPL...4...99J}}</ref>
 }}

Observation data Epoch J2000 Equinox J2000
Constellation	Telescopium
Right ascension	18^h 11^m 04.40^s^[1]
Declination	−47° 30′ 47.24″^[1]
Apparent magnitude (V)	6.07±0.01^[2]
Characteristics
Spectral type	K1 III CN2^[3]
B−V color index	+1.20^[4]
Astrometry

Radial velocity (R_v)	−14.9±2.9^[5] km/s
Proper motion (μ)	RA: −3.69±0.39 mas/yr^[6] Dec.: −29.50±0.23 mas/yr^[6]
Parallax (π)	5.6048 ± 0.0652 mas^[1]
Distance	582 ± 7 ly (178 ± 2 pc)
Absolute magnitude (M_V)	−0.12^[7]

Details

Mass	1.24^[8] `M`_☉
Radius	20.1^[9] `R`_☉
Luminosity	165^[7] `L`_☉
Surface gravity (log g)	1.89^[8] cgs
Temperature	4,529±93^[10] K
Metallicity [Fe/H]	−0.07^[8] dex
Rotational velocity (v sin i)	<1^[11] km/s

Other designations
CD−47 12098, HD 166006, HIP 89096, HR 6778, WDS J18111-4731A^[12]
Database references
SIMBAD	data