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U Camelopardalis: Difference between revisions

Coordinates: Sky map 03h 41m 48.17393s, +62° 38′ 54.3906″
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{{Sky|03|41|48.17393|+|62|38|54.3906}}
{{Sky|03|41|48.17393|+|62|38|54.3906}}
{{Starbox begin

⚫
|name=U Camelopardalis}}
{{Infobox Star
{{Starbox image
| bgcolour = yellow
| name = U Camelopardalis
| image = [[File:U Camelopardalis.jpeg|250px]]
⚫
| caption=U Camelopardalis is a bright star surrounded by a tenuous shell of gas. Its atmosphere contains more carbon than oxygen.
⚫
| image = [[File:U Camelopardalis.jpeg|300px]]
}}
⚫
| caption = U Camelopardalis is a bright star surrounded by a tenuous shell of gas. Its atmosphere contains more carbon than oxygen.
{{Starbox observe
| observation_data = yes
| epoch = [[J2000]]
|constell=[[Camelopardalis]]
|epoch=[[J2000]]
| constellation = [[Camelopardalis (constellation)|Camelopardalis]]<ref name=hubble>{{cite news|title=Red Giant Blows a Bubble|url=http://www.spacetelescope.org/images/potw1227a/|accessdate=3 July 2012|newspaper=ESA/Hubble Picture of the Week}}</ref>
| ra = {{RA|03|41|48.17393}}<ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}</ref>
| ra = {{RA|03|41|48.17393}}<ref name=simbad>{{cite web|title=Search Results for U Camelopardalis|url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=U+Camelopardalis|work=Astronomical Database|publisher=SIMBAD|accessdate=3 July 2012}}</ref>
| dec = {{DEC|+62|38|54.3906}}<ref name=simbad/>
| dec = {{DEC|+62|38|54.3906}}<ref name="van Leeuwen2007"/>
| apparent_magnitude = 7.35<ref name=simbad/>
|appmag_v=11.00<ref name=SIMBAD>{{cite simbad|title=U Cam|accessdate=18 February 2016}}</ref> }}
{{Starbox character
| absolute_magnitude =
|class=C5<sub>4</sub><ref name=SIMBAD/> (N5)<ref name=AAVSOUZ>{{cite web|url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=4537|title=VSX: Detail for U Cam|author=Otero, Sebastian Alberto|date=15 April 2012|work=The International Variable Star Index|publisher=American Association of Variable Star Observers|accessdate=18 January 2017}}</ref>
|b-v=+1.95<ref name=UBV>{{cite journal|author1=Mermilliod, J.-C.|title=Catalogue of homogeneous data in the UBV photoelectric photometric system|journal=Astronomy and Astrophysics|volume=34|pages=1–49|date=1978|bibcode=1978A&AS...34....1N}}</ref>
|u-b=+3.50<ref name=UBV/>
|variable=[[Semiregular variable star|SRb]]
}}
{{Starbox astrometry
|radial_v=-3.00<ref name=RV>{{cite journal|url=http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053}}</ref>
|prop_mo_ra=3.50<ref name="van Leeuwen2007"/>
|prop_mo_dec=-3.62<ref name="van Leeuwen2007"/>
|parallax=1.03
|p_error=0.59
|parallax_footnote=<ref name="van Leeuwen2007"/>
|absmag_bol=-5.09<ref name=Bergeat>{{cite journal|author1=Bergeat, J.|author2=Chevallier, L.|date=2005|title=The mass loss of C-rich giants|journal=Astronomy and Astrophysics|volume=429|pages=235–246|bibcode=2005A&A...429..235B|arxiv=astro-ph/0601366|doi=10.1051/0004-6361:20041280}}</ref>
}}
{{Starbox detail
|temperature=2695<ref name=Bergeat/>
}}
}}
{{Starbox catalog
|names=[[Variable star designation|U]] Cam, [[Bonner Durchmusterung|BD]]+62° 596, [[Henry Draper Catalogue|HD]] 22611, [[Hipparcos catalogue|HIP]] 17257, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 12870, [[Boss General Catalogue|GC]] 4371}}
{{Starbox reference
|Simbad=HD+22611}}
{{Starbox end}}
'''U Camelopardalis''' is a [[semiregular variable star|semiregular]] [[variable star|variable]] [[star]] in the [[constellation]] [[Camelopardalis]]. Based on [[stellar parallax|parallax]] measurements made by the [[Hipparcos]] [[spacecraft]], it is located about 3,000 [[light-year]]s (1,000 [[parsec]]s) away from the [[Earth]].<ref name="van Leeuwen2007"/> Its [[apparent magnitude]] is about 11, which is dim enough that it cannot be seen with the unaided eye.<ref name=SIMBAD/>


U Camelopardalis is a [[carbon star]]. These types of stars are known for having large amounts of [[carbon]] in their atmospheres, forming carbon compounds that make the star appear strikingly red. Under the [[Carbon star#Spectra|Morgan–Keenan]] classification of carbon stars, UZ Pyxidis' [[spectral type]] is C5<sub>5</sub>; if it were a normal [[giant star]], this would correspond to a [[spectral type]] of M.<ref>{{cite journal|author1=Keenan, P. C.|author2=Morgan, W. W.|date=1941|title=The Classification of the Red Carbon Stars|journal=[[The Astrophysical Journal]]|volume=94|page=501|bibcode=1941ApJ....94..501K|doi=10.1086/144356}}</ref> The shell of gas surrounding U Camelopardalis was imaged by the [[Hubble Space Telescope]] in 2012, showing a nearly perfect sphere of gas surrounding the star.<ref>{{cite news|title=Red Giant Blows a Bubble|url=http://www.spacetelescope.org/images/potw1227a/|accessdate=18 February 2017|newspaper=ESA/Hubble Picture of the Week}}</ref>
'''U Camelopardalis''', or '''U Cam''', is a [[carbon star]] located 1500 light years away in the constellation of [[Camelopardalis (constellation)|Camelopardalis]], near the North Celestial Pole.<ref>{{cite web|url=http://www.nasa.gov/multimedia/imagegallery/image_feature_2302.html |title=NASA - Hubble Sees Red Giant Blow a Bubble |publisher=Nasa.gov |date=2012-07-06 |accessdate=2012-10-28}}</ref>


==References==
==References==
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[[Category:Henry Draper Catalogue objects|022611]]
[[Category:Henry Draper Catalogue objects|022611]]
[[Category:Hipparcos objects|017257]]
[[Category:Hipparcos objects|017257]]
[[Category:Durchmusterung objects]]
[[Category:Semiregular variable stars]]
[[Category:Semiregular variable stars]]
[[Category:Asymptotic-giant-branch stars]]
[[Category:Asymptotic-giant-branch stars]]

Revision as of 00:07, 19 February 2017

U Camelopardalis

U Camelopardalis is a bright star surrounded by a tenuous shell of gas. Its atmosphere contains more carbon than oxygen.
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 03h 41m 48.17393s[1]
Declination +62° 38′ 54.3906″[1]
Apparent magnitude (V) 11.00[2]
Characteristics
Spectral type C54[2] (N5)[3]
U−B color index +3.50[4]
B−V color index +1.95[4]
Variable type SRb
Astrometry
Radial velocity (Rv)-3.00[5] km/s
Proper motion (μ) RA: 3.50[1] mas/yr
Dec.: -3.62[1] mas/yr
Parallax (π)1.03 ± 0.59 mas[1]
Distanceapprox. 3,000 ly
(approx. 1,000 pc)
Absolute bolometric
magnitude (Mbol)		-5.09[6]
Details
Temperature2695[6] K
Other designations
U Cam, BD+62° 596, HD 22611, HIP 17257, SAO 12870, GC 4371
Database references
SIMBADdata

U Camelopardalis is a semiregular variable star in the constellation Camelopardalis. Based on parallax measurements made by the Hipparcos spacecraft, it is located about 3,000 light-years (1,000 parsecs) away from the Earth.[1] Its apparent magnitude is about 11, which is dim enough that it cannot be seen with the unaided eye.[2]

U Camelopardalis is a carbon star. These types of stars are known for having large amounts of carbon in their atmospheres, forming carbon compounds that make the star appear strikingly red. Under the Morgan–Keenan classification of carbon stars, UZ Pyxidis' spectral type is C55; if it were a normal giant star, this would correspond to a spectral type of M.[7] The shell of gas surrounding U Camelopardalis was imaged by the Hubble Space Telescope in 2012, showing a nearly perfect sphere of gas surrounding the star.[8]

References

  1. ^ a b c d e f 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 "U Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 February 2016.
  3. ^ Otero, Sebastian Alberto (15 April 2012). "VSX: Detail for U Cam". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 18 January 2017.
  4. ^ a b Mermilliod, J.-C. (1978). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics. 34: 1–49. Bibcode:1978A&AS...34....1N.
  5. ^ Gontcharov, G. A. (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.
  6. ^ a b Bergeat, J.; Chevallier, L. (2005). "The mass loss of C-rich giants". Astronomy and Astrophysics. 429: 235–246. arXiv:astro-ph/0601366. Bibcode:2005A&A...429..235B. doi:10.1051/0004-6361:20041280.
  7. ^ Keenan, P. C.; Morgan, W. W. (1941). "The Classification of the Red Carbon Stars". The Astrophysical Journal. 94: 501. Bibcode:1941ApJ....94..501K. doi:10.1086/144356.
  8. ^ "Red Giant Blows a Bubble". ESA/Hubble Picture of the Week. Retrieved 18 February 2017.


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