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{{Starbox begin
{{refimprove|date=August 2017}}
| name=HD 15524
{{Starbox begin |
}}
name=HD 16955 }}
{{Starbox observe |
{{Starbox observe
epoch=J2000 |
| epoch = J2000
| constell = [[Aries (constellation)|Aries]]
ra=02<sup>h</sup> 43<sup>m</sup> 51.2441<sup>s</sup> |
| ra = {{RA|02|43|51.24421}}<ref name=vanLeeuwen2007/>
dec= +25° 38&prime; 18.0493&Prime; |
| dec = {{DEC|+25|38|18.0493}}<ref name=vanLeeuwen2007/>
appmag_v=6.36 |
| appmag_v = 6.376<ref name=Murphy2017/>
constell=[[Aries (constellation)|Aries]] }}
}}
{{Starbox character |
{{Starbox character
class=A3V |
| class = A3&nbsp;V<ref name=Cowley1969/>
r-i = |
| b-v = {{Val|0.089|0.002}}<ref name=Anderson2012/>
v-r = |
b-v =|
| u-b =
}}
u-b = |
{{Starbox astrometry
variable= }}
| radial_v = {{Val|-10.3|3.1}}<ref name=Gontcharov2006/>
{{Starbox astrometry |
| prop_mo_ra = {{Val|−4.98|0.70}}<ref name=vanLeeuwen2007/>
radial_v=-10.30 ± 3.1 |
prop_mo_ra=-4.98 ± 0.70<ref name="van Leeuwen2007"/> |
| prop_mo_dec = {{Val|+6.04|0.52}}<ref name=vanLeeuwen2007/>
| parallax = 9.59
prop_mo_dec=6.04 ± 0.52<ref name="van Leeuwen2007"/> |
| p_error = 0.76
parallax=9.59 |
| parallax_footnote = <ref name=vanLeeuwen2007/>
p_error=0.76 |
| absmag_v = {{Val|+1.18|0.13}}<ref name=Murphy2017/>
parallax_footnote = <ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/articles/aa/full/2007/41/aa8357-07/aa8357-07.html | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=52107 Vizier catalog entry ]</ref> |
}}
absmag_v= }}
{{Starbox catalog |
{{Starbox detail
| source =
names=[[Henry Draper Catalogue|HD]] 16955, [[Hipparcos Input Catalogue|HIC]] 12744, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 75539, [[Durchmusterung|BD]]+25° 441, [[Hipparcos Catalogue|HIP]] 12744, [[Bright Star Catalogue|HR]] 803. }}
| component1 = HD 16955 A
{{Starbox reference |
| mass = {{Val|2.25|0.08}}<ref name=zorec2012/>
Simbad=HD+16955
| ARICNS = }}
| radius =
| luminosity = {{Val|26.9|3.3|2.9}}<ref name=Murphy2017/>
| gravity =
| temperature = {{Val|8450|164|fmt=commas}}<ref name=Murphy2017/>
| metal_fe =
| rotational_velocity = 175<ref name=Royer2007/>
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist | BD=+25°&nbsp;441 | FK5= | HD=16955 | HIP=12744 | HR=803 | SAO=75539 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = HD+16955
}}
{{Starbox end}}
{{Starbox end}}

'''HD 16955''', also known as '''HR 803''', is a double or multiple star.
'''HD 16955''', also known as '''HR 803''', is a double or multiple star. With an [[apparent visual magnitude]] of 6.376,<ref name=Murphy2017/> is lies at or below the nominal limit for visibility with a typical naked eye. The measured annual [[stellar parallax|parallax shift]] is 9.59&nbsp;[[milliarcsecond]]s, which yields an estimated distance of around 340&nbsp;[[light year]]s. The star is moving closer to the Sun with a heliocentric [[radial velocity]] of around -10&nbsp;km/s.<ref name=Gontcharov2006/>

This is an [[A-type main-sequence star]] with a [[stellar classification]] of A3&nbsp;V.<ref name=Cowley1969/> Hauck et al. (1995) identified this as a [[Lambda Boötis star]] with a circumstellar shell,<ref name=Hauck1995/> but this now appears to be unlikely.<ref name=Murphy2017/> It has 2.25<ref name=zorec2012/> times the [[mass of the Sun]] and is spinning rapidly with a [[projected rotational velocity]] of 175&nbsp;km/s.<ref name=Royer2007/> The star is radiating about 27<ref name=Murphy2017/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of roughly 8,450&nbsp;K.<ref name=Murphy2017/>

HD 16955 has a magnitude 10.36 companion, component B, which is located, as of 2015, at an [[angular separation]] of 3.0&nbsp;[[arcsecond]]s along a [[position angle]] of 19°.<ref name=Mason2014/> This is the likely source for the detected [[X-ray astronomy|X-ray emission]] with a luminosity of {{Val|262.5e20|u=W}} coming from these coordinates, since A-type stars are not expected to emit X-rays.<ref name=Schroeder2007/> Component C is a more distant magnitude 12.94 companion located at a separation of 51.10&nbsp;arcseconds along a position angle of 92°, as of 2015.<ref name=Mason2014/>


==References==
==References==
{{reflist}}
{{reflist|refs=

<ref name=vanLeeuwen2007>{{cite journal
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | year=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 }}</ref>

<ref name=Anderson2012>{{citation
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | postscript=. }}</ref>

<ref name=Gontcharov2006>{{cite journal
| last1=Gontcharov | first1=G. A.
| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system
| journal=Astronomy Letters | postscript=.
| volume=32 | issue=11 | pages=759–771 | date=November 2006
| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G
| arxiv=1606.08053 }}</ref>

<ref name=Mason2014>{{citation
| display-authors=1 | last1=Mason | first1=B. D.
| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog | year=2014
| bibcode=2001AJ....122.3466M | doi=10.1086/323920 | postscript=.
| volume=122 | journal=The Astronomical Journal | pages=3466–3471 }}</ref>

<ref name=Hauck1995>{{citation
| title=Three other λ Bootis stars with a shell
| display-authors=1 | last1=Hauck | first1=B.
| last2=Ballereau | first2=D. | last3=Chauville | first3=J.
| journal=Astronomy and Astrophysics Suppl.
| volume=109 | pages=505−510 | date=March 1995
| bibcode=1995A&AS..109..505H }}</ref>

<ref name=Schroeder2007>{{citation
| title=X-ray emission from A-type stars
| last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M.
| journal=Astronomy and Astrophysics | postscript=.
| volume=475 | issue=2 | date=November 2007 | pages=677−684
| doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S }}</ref>

<ref name=zorec2012>{{cite journal
| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities
| journal=Astronomy & Astrophysics
| author1=Zorec | first1=J. | last2=Royer | first2=F.
| volume=537 | pages=A120 | year=2012
| doi=10.1051/0004-6361/201117691
| bibcode=2012A&A...537A.120Z | arxiv=1201.2052 }}</ref>

<ref name=Royer2007>{{cite journal
| display-authors=1 | last1=Royer | first1=F.
| last2=Zorec | first2=J. | last3=Gómez | first3=A. E.
| title=Rotational velocities of A-type stars. III. Velocity distributions
| journal=Astronomy and Astrophysics
| volume=463 | issue=2 | pages=671–682 | date=February 2007
| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R
| arxiv=astro-ph/0610785 }}</ref>

<ref name=Murphy2017>{{citation
| title=Gaia's view of the λ Boo star puzzle
| last1=Murphy | first1=Simon J. | last2=Paunzen | first2=Ernst
| journal=Monthly Notices of the Royal Astronomical Society
| volume=466 | issue=1 | pages=546−555 | date=April 2017
| doi=10.1093/mnras/stw3141 | bibcode=2017MNRAS.466..546M }}</ref>

<ref name=Cowley1969>{{cite journal
| last1=Cowley | first1=A. | last2=Cowley | first2=C.
| last3=Jaschek | first3=M. | last4=Jaschek | first4=C.
| title=A study of the bright A stars. I. A catalogue of spectral classifications
| journal=Astronomical Journal | display-authors=1
| volume=74 | pages=375–406 | date=April 1969
| doi=10.1086/110819 | bibcode=1969AJ.....74..375C }}</ref>

<ref name=SIMBAD>{{cite simbad | title=HD 16955 | access-date=2018-02-26 }}</ref>

}}


{{Stars of Aries}}
{{Stars of Aries}}


[[Category:Aries (constellation)]]
[[Category:A-type main-sequence stars]]
[[Category:A-type main-sequence stars]]
[[Category:Lambda Boötis stars]]
[[Category:Double stars]]
[[Category:Aries (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|016955]]
[[Category:Henry Draper Catalogue objects|016955]]
[[Category:Hipparcos objects|012744]]
[[Category:Hipparcos objects|012744]]
[[Category:HR objects|0803]]
[[Category:HR objects|0803]]
[[Category:Durchmusterung objects]]


{{Multi-star-stub}}

Revision as of 18:32, 27 February 2018

HD 15524
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 43m 51.24421s[1]
Declination +25° 38′ 18.0493″[1]
Apparent magnitude (V) 6.376[2]
Characteristics
Spectral type A3 V[3]
B−V color index 0.089±0.002[4]
Astrometry
Radial velocity (Rv)−10.3±3.1[5] km/s
Proper motion (μ) RA: −4.98±0.70[1] mas/yr
Dec.: +6.04±0.52[1] mas/yr
Parallax (π)9.59 ± 0.76 mas[1]
Distance340 ± 30 ly
(104 ± 8 pc)
Absolute magnitude (MV)+1.18±0.13[2]
Details
HD 16955 A
Mass2.25±0.08[6] M☉
Luminosity26.9+3.3
−2.9[2] L☉
Temperature8,450±164[2] K
Rotational velocity (v sin i)175[7] km/s
Other designations
BD+25° 441, HD 16955, HIP 12744, HR 803, SAO 75539[8]
Database references
SIMBADdata

HD 16955, also known as HR 803, is a double or multiple star. With an apparent visual magnitude of 6.376,[2] is lies at or below the nominal limit for visibility with a typical naked eye. The measured annual parallax shift is 9.59 milliarcseconds, which yields an estimated distance of around 340 light years. The star is moving closer to the Sun with a heliocentric radial velocity of around -10 km/s.[5]

This is an A-type main-sequence star with a stellar classification of A3 V.[3] Hauck et al. (1995) identified this as a Lambda Boötis star with a circumstellar shell,[9] but this now appears to be unlikely.[2] It has 2.25[6] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 175 km/s.[7] The star is radiating about 27[2] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,450 K.[2]

HD 16955 has a magnitude 10.36 companion, component B, which is located, as of 2015, at an angular separation of 3.0 arcseconds along a position angle of 19°.[10] This is the likely source for the detected X-ray emission with a luminosity of 262.5×1020 W coming from these coordinates, since A-type stars are not expected to emit X-rays.[11] Component C is a more distant magnitude 12.94 companion located at a separation of 51.10 arcseconds along a position angle of 92°, as of 2015.[10]

References

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c d e f g h Murphy, Simon J.; Paunzen, Ernst (April 2017), "Gaia's view of the λ Boo star puzzle", Monthly Notices of the Royal Astronomical Society, 466 (1): 546−555, Bibcode:2017MNRAS.466..546M, doi:10.1093/mnras/stw3141
  3. ^ a b Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
  4. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  5. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.{{cite journal}}: CS1 maint: postscript (link)
  6. ^ a b Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  7. ^ a b Royer, F.; et al. (February 2007). "Rotational velocities of A-type stars. III. Velocity distributions". Astronomy and Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224.
  8. ^ "HD 16955". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-26.
  9. ^ Hauck, B.; et al. (March 1995), "Three other λ Bootis stars with a shell", Astronomy and Astrophysics Suppl., 109: 505−510, Bibcode:1995A&AS..109..505H
  10. ^ a b Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  11. ^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677−684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
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