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Update stellar parameters, Gaia DR3 astrometry
Simbad doesn't show that spectral class (did it ever?)
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| ra={{RA|03|42|09.32551}}<ref name=DR3/>
| ra={{RA|03|42|09.32551}}<ref name=DR3/>
| dec={{DEC|+63|13|00.4686}}<ref name=DR3/>
| dec={{DEC|+63|13|00.4686}}<ref name=DR3/>
| appmag_v=5.11
| appmag_v=5.11<ref name=SIMBAD>{{cite simbad|title=BD Cam|access-date=27 December 2016}}</ref>
| constell=[[Camelopardalis (constellation)|Camelopardalis]] }}
| constell=[[Camelopardalis (constellation)|Camelopardalis]]
}}
{{Starbox character
{{Starbox character
|class=S3.5/2 (M4III)<ref name=SIMBAD/>
| type = [[asymptotic giant branch|AGB]]<ref name=guandalini2008/>
| class=S3.5/2<ref name=keenan1980>{{cite journal|bibcode=1980ApJS...43..379K|title=Spectral types of S and SC stars on the revised MK system|journal=The Astrophysical Journal Supplement Series|volume=43|pages=379|last1=Keenan|first1=P. C.|last2=Boeshaar|first2=P. C.|year=1980|doi=10.1086/190673|doi-access=free}}</ref> (M4III)<ref>{{cite journal |bibcode=1967PDAO...13...47Y }}</ref>
⚫
|r-i = 1.39
|v-r =
| r-i = 1.39
⚫
| v-r =
|b-v = 1.63<ref name=UBV>{{cite journal | title= Photometry of high-luminosity M-type stars | last1=van Leeuwen | first1=F. | journal= Astrophysical Journal | volume=162 | page=217 | date=1970 | bibcode=1970ApJ...162..217L | doi=10.1086/150648 | doi-access=free }}</ref>
| b-v = 1.63<ref name=UBV>{{cite journal | title= Photometry of high-luminosity M-type stars | last1=van Leeuwen | first1=F. | journal= Astrophysical Journal | volume=162 | page=217 | date=1970 | bibcode=1970ApJ...162..217L | doi=10.1086/150648 | doi-access=free }}</ref>
| u-b = 1.82<ref name=UBV/>
| u-b = 1.82<ref name=UBV/>
| variable=[[Slow irregular variable|Lb]]<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
| variable=[[Slow irregular variable|Lb]]<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
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| dist_ly = {{Val|{{convert|231|pc|ly|disp=number}}|{{convert|11|pc|ly|disp=number}}|{{convert|15|pc|ly|disp=number}}}}
| dist_ly = {{Val|{{convert|231|pc|ly|disp=number}}|{{convert|11|pc|ly|disp=number}}|{{convert|15|pc|ly|disp=number}}}}
| dist_footnote = <ref name="b-j">{{Cite journal |last1=Bailer-Jones |first1=C. A. L. |last2=Rybizki |first2=J. |last3=Fouesneau |first3=M. |last4=Demleitner |first4=M. |last5=Andrae |first5=R. |date=2021-03-01 |title=Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3 |journal=The Astronomical Journal |volume=161 |issue=3 |pages=147 |doi=10.3847/1538-3881/abd806 |doi-access=free |arxiv=2012.05220 |bibcode=2021AJ....161..147B |issn=0004-6256}} Data about this star can be seen [https://dc.zah.uni-heidelberg.de/gedr3dist/q/cone/form here].</ref>
| dist_footnote = <ref name="b-j">{{Cite journal |last1=Bailer-Jones |first1=C. A. L. |last2=Rybizki |first2=J. |last3=Fouesneau |first3=M. |last4=Demleitner |first4=M. |last5=Andrae |first5=R. |date=2021-03-01 |title=Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3 |journal=The Astronomical Journal |volume=161 |issue=3 |pages=147 |doi=10.3847/1538-3881/abd806 |doi-access=free |arxiv=2012.05220 |bibcode=2021AJ....161..147B |issn=0004-6256}} Data about this star can be seen [https://dc.zah.uni-heidelberg.de/gedr3dist/q/cone/form here].</ref>
| absmag_v=-0.90 }}
| absmag_v=-0.90
}}
{{Starbox orbit
{{Starbox orbit
| reference=<ref>{{cite journal|title=Re-processing the Hipparcos Transit Data and Intermediate Astrometric Data of spectroscopic binaries. I. Ba, CH and Tc-poor S stars|author1=Pourbaix, D.|journal=Astronomy and Astrophysics Supplement|volume=145|pages=161–183|date=2000|bibcode=2000A&AS..145..161P|doi=10.1051/aas:2000346|arxiv=astro-ph/0006175|s2cid=15990458}}</ref>
| reference=<ref>{{cite journal|title=Re-processing the Hipparcos Transit Data and Intermediate Astrometric Data of spectroscopic binaries. I. Ba, CH and Tc-poor S stars|author1=Pourbaix, D.|journal=Astronomy and Astrophysics Supplement|volume=145|pages=161–183|date=2000|bibcode=2000A&AS..145..161P|doi=10.1051/aas:2000346|arxiv=astro-ph/0006175|s2cid=15990458}}</ref>
Line 59: Line 62:
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=[[Variable star designation|BD]] Cam, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 12874, [[Bonner Durchmusterung|BD]]+62°597, [[Henry Draper Catalogue|HD]] 22649, [[Hipparcos Catalogue|HIP]] 17296, [[FK5]] 129, [[Bright Star Catalogue|HR]] 1105<ref name=SIMBAD/> }}
| names=[[Variable star designation|BD]] Cam, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 12874, [[Bonner Durchmusterung|BD]]+62°597, [[Henry Draper Catalogue|HD]] 22649, [[Hipparcos Catalogue|HIP]] 17296, [[FK5]] 129, [[Bright Star Catalogue|HR]] 1105<ref name=SIMBAD>{{cite simbad|title=BD Cam|access-date=27 December 2016}}</ref>
}}
{{Starbox reference
{{Starbox reference
| Simbad=HD+22649 }}
| Simbad=HD+22649 }}

Revision as of 15:17, 24 May 2025

BD Camelopardalis

A light curve for BD Camelopardalis from Hipparcos data, adapted from Adelman (1998)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 03h 42m 09.32551s[2]
Declination +63° 13′ 00.4686″[2]
Apparent magnitude (V) 5.11
Characteristics
Evolutionary stage AGB[3]
Spectral type S3.5/2[4] (M4III)[5]
U−B color index 1.82[6]
B−V color index 1.63[6]
R−I color index 1.39
Variable type Lb[7]
Astrometry
Radial velocity (Rv)-22.28[8] km/s
Proper motion (μ) RA: −17.877 mas/yr[2]
Dec.: +20.052 mas/yr[2]
Parallax (π)4.2671±0.2581 mas[2]
Distance750+36
−49 ly
(231+11
−15 pc)[9]
Absolute magnitude (MV)-0.90
Orbit[10]
PrimaryBD Cam A
CompanionBD Cam B
Period (P)596.2 days
Eccentricity (e)0.088
Inclination (i)105.6°
Longitude of the node (Ω)162.1°
Periastron epoch (T)2442794.5
Argument of periastron (ω)
(secondary)		334.3°
Details
Red giant primary
Mass2.68[11] M☉
Radius148+8
−10[12] R☉
Luminosity2,000[13] L☉
Surface gravity (log g)1.5[11] cgs
Temperature3,600±150[13] K
Metallicity−0.25[11]
Other designations
BD Cam, SAO 12874, BD+62°597, HD 22649, HIP 17296, FK5 129, HR 1105[8]
Database references
SIMBADdata

BD Camelopardalis is an S star and symbiotic star in the constellation Camelopardalis. It is a 5th magnitude star, and is visible to the naked eye under good observing conditions. It was recognized as a spectroscopic binary star in 1922, and its orbital solution published in 1984;[14] it has a 596-day orbital period. A spectroscopic composition analysis was done of the red giant primary star in 1986.[15]

Description

Although the star's spectrum shows the spectral features of zirconium oxide which define spectral class S, BD Cam shows no technetium lines in its spectrum. It is believed to be an "extrinsic" S star, one whose s-process element excesses originate in a binary companion star.

In 1928, Joel Stebbins and Charles Morse Huffer announced that the star, then called HR 1105, is a variable star, based on observations made at Washburn Observatory.[16] It was given its variable star designation, BD Camelopardalis, in 1977.[17] The system displays only minimal variations in the visible, but the presence of the companion and its interactions with the stellar wind of the visible red giant makes for easily observed time-variable spectral features in the ultraviolet and in the near infrared spectral line of helium.

At times BD Cam is the brightest S star in the visible sky, because other bright S stars are Mira variables or other types of variable star with large changes in apparent brightness. Its own brightness variability in the visible part of the spectrum is modest.

On the basis of the measurement of radial velocities of the line components it is concluded that the helium emission originates in the vicinity of the inner Lagrangian point of the system, indicating a gas motion from the red giant primary, directed to the secondary, with a velocity of about 5 km/s. At the same time, there is a high-velocity, hot wind outwards from the primary red giant with a velocity of about 50 km/s.

— Shcherbakov, A. G. and Tuominen, I.

However, HR 1105 appears to have a highly variable UV companion. In 1982, no UV flux was discerned for this system, but by 1986 C IV was strong, increasing by a factor of 3 in 1987 with prominent lines of Si III, C III, O III, Si IV, and N V.

— Ake, Thomas B., III; Johnson, Hollis R. and Perry, Benjamin F., Jr.

References

  1. ^ Adelman, S. J. (May 1998). "BVRI photometry of the extrinsic S star HR 1105". Astronomy & Astrophysics. 333: 952–955. Bibcode:1998A&A...333..952A. Retrieved 8 November 2021.
  2. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ Cite error: The named reference guandalini2008 was invoked but never defined (see the help page).
  4. ^ Keenan, P. C.; Boeshaar, P. C. (1980). "Spectral types of S and SC stars on the revised MK system". The Astrophysical Journal Supplement Series. 43: 379. Bibcode:1980ApJS...43..379K. doi:10.1086/190673.
  5. ^ . Bibcode:1967PDAO...13...47Y. {{cite journal}}: Cite journal requires |journal= (help); Missing or empty |title= (help)
  6. ^ a b van Leeuwen, F. (1970). "Photometry of high-luminosity M-type stars". Astrophysical Journal. 162: 217. Bibcode:1970ApJ...162..217L. doi:10.1086/150648.
  7. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  8. ^ a b "BD Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 December 2016.
  9. ^ Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
  10. ^ Pourbaix, D. (2000). "Re-processing the Hipparcos Transit Data and Intermediate Astrometric Data of spectroscopic binaries. I. Ba, CH and Tc-poor S stars". Astronomy and Astrophysics Supplement. 145: 161–183. arXiv:astro-ph/0006175. Bibcode:2000A&AS..145..161P. doi:10.1051/aas:2000346. S2CID 15990458.
  11. ^ a b c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  12. ^ Baines, Ellyn K.; Clark, James H.; Kingsley, Bradley I.; Schmitt, Henrique R.; Stone, Jordan M. (2025-05-07). "Vintage NPOI: New and Updated Angular Diameters for 145 Stars". The Astronomical Journal. 169 (6): 293. Bibcode:2025AJ....169..293B. doi:10.3847/1538-3881/adc930. ISSN 1538-3881. Note: Full catalogue: [1]
  13. ^ a b Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (2020-01-01). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Epsilon Carinae's database entry at VizieR.
  14. ^ Griffin, R.F. (1984). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 58: HR 1105". Observatory. 104: 224–231. Bibcode:1984Obs...104..224G.
  15. ^ Smith, V.V.; Lambert, D.L. (1986). "The chemical composition of red giants. II - Helium burning and the s-process in the MS and S stars". Astrophysical Journal. 311: 843–863. Bibcode:1986ApJ...311..843S. doi:10.1086/164823.
  16. ^ Stebbins, Joel; Huffer, C. M. (1928). "The Constancy of the Light of Red Stars". Publications of the Washburn Observatory. 15: 137–174. Bibcode:1928PWasO..15..137S. Retrieved 5 December 2024.
  17. ^ Kukarkin, B. V.; Kholopov, P. N.; Fedorovich, V. P.; Kireyeva, N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (March 1977). "62nd Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 1248: 1. Bibcode:1977IBVS.1248....1K. Retrieved 29 December 2024.
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