CQ Camelopardalis

CQ Camelopardalis, abbreviated as CQ Cam, is a solitary^[13] variable star in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.19,^[3] making it visible to the naked eye under ideal conditions. The object is relatively far at a distance of about 2,000 light years^[2] but is drifting closer with a heliocentric radial velocity of −22 km/s.^[7] It has a peculiar velocity of 21.8+2.1
−1.9 km/s, making it a runaway star.^[8]

CQ Camelopardalis

A light curve for CQ Camelopardalis, plotted from Hipparcos data[1]
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Camelopardalis
Right ascension	03h 24m 40.5567s[2]
Declination	+64° 35′ 09.580″[2]
Apparent magnitude (V)	5.19[3]
Characteristics
Evolutionary stage	AGB[4]
Spectral type	M0 II[5]
B−V color index	+2.05[3]
R−I color index	+1.23[3]
Variable type	Lc?[6]
Astrometry
Radial velocity (Rv)	−22.2±0.5[7] km/s
Proper motion (μ)	RA: −3.734 mas/yr[2] Dec.: −0.171 mas/yr[2]
Parallax (π)	1.6385 ± 0.1030 mas[2]
Distance	2,000 ± 100 ly (610 ± 40 pc)
Details
Mass	12.7±0.5[8] M☉
Radius	333[9] R☉
Luminosity	13,236[10] L☉
Surface gravity (log g)	0.48±0.08[11] cgs
Temperature	3,790±122[9] K
Metallicity [Fe/H]	+0.17±0.04[11] dex
Age	15.8±0.3[8] Myr
Other designations
CQ Cam, NSV 1121, AG+64°221, BD+64°391, FK5 1096, GC 4034, HD 20797, HIP 15890, HR 1009, SAO 12743[12]
Database references
SIMBAD	data

CQ Cam has a stellar classification of M0 II,^[5] indicating that it is a red bright giant. CQ Cam is currently on the asymptotic giant branch, fusing hydrogen and helium shells around an inert carbon core. At present it has 12.7 times the mass of the Sun but, at the age of 16 million years,^[8] it has expanded to 333 times the radius of the Sun.^[9] The object is a luminous star, with a bolometric luminosity over 10,000 times that of the Sun.^[10] Despite this brightness, CQ Cam's large diameter yields an effective temperature of 3,790 K^[9] from its photosphere, giving a red hue.

CQ Cam has been classified as a low amplitude slow irregular variable based on Hipparcos photometry.^[6] However, there have not been enough observations to confirm this.^[14]

References

1. "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
3. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
4. Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239. ISSN 0004-6256.
5. Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. eISSN 1538-4365. ISSN 0067-0049.
6. Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. ISSN 1063-7729. S2CID 255195566.
7. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
8. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1). Oxford University Press (OUP): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711.
9. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
10. 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.
11. Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2 December 2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. eISSN 1432-0746. ISSN 0004-6361.
12. "CQ Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 10, 2022.
13. Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711.
14. 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. S2CID 119257644.