Star in the constellation Camelopardalis
HD 27245 Location of HD 27245 on the map (circled) |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
Constellation | Camelopardalis |
Right ascension | 04h 21m 47.64917s[1] |
Declination | +60° 44′ 08.2461″[1] |
Apparent magnitude (V) | 5.40±0.01[2] |
Characteristics |
Spectral type | M0 III[3] |
B−V color index | +1.50[4] |
Variable type | suspected[5] |
Astrometry |
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Radial velocity (Rv) | +25.2±0.3[6] km/s |
Proper motion (μ) | RA: +55.890 mas/yr[1] Dec.: −114.046 mas/yr[1] |
Parallax (π) | 5.3716 ± 0.0848 mas[1] |
Distance | 607 ± 10 ly (186 ± 3 pc) |
Absolute magnitude (MV) | −0.27[7] |
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Details |
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Mass | 1.18[8] M☉ |
Radius | 52.8±2.7[9] R☉ |
Luminosity | 570±16[10] L☉ |
Surface gravity (log g) | 1.29[11] cgs |
Temperature | 4,033±122[12] K |
Metallicity [Fe/H] | +0.11[8] dex |
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Other designations |
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Database references |
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SIMBAD | data |
HD 27245, also known as HR 1335 or rarely 25 H. Camelopardalis is a solitary red-hued star[15] located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.4,[2] making it faintly visible to the naked eye. Gaia DR3 Parallax measurements place it approximately 607 light years[1] away from it the Solar System and is drifting further away with a heliocentric radial velocity of 25.2 km/s.[6] At its current distance, HD 27245's brightness is diminished by 0.36 magnitudes due to extinction from interstellar dust.[16] It has an absolute magnitude of −0.27.[7]
HD 27245 is an aging red giant with a stellar classification of M0 III.[3] It has 118% the mass of the Sun[8] but has expanded to a radius of 52.8 R☉.[11] It radiates 570 times the luminosity of the Sun[10] from its enlarged photosphere at an effective temperature of 4,033 K.[12] HD 27245's iron abundance is 129% that of the Sun's,[8] making it metal enriched.
HD 27245 is a suspected variable star with an amplitude of 0.05 magnitudes.[5] Its variability was first observed in 1930 by Joel Stebbins.[17] However, Eggen (1967) instead lists it as an ordinary M-type giant and used the object for comparison.[18] In 1978-9, HD 28245 was again listed as a variable star but did not provide further insight.[19] As of 2017, the star has not been confirmed to be variable.[5]
References
- ^ a b c d e 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.
- ^ a b 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 Appenzeller, Immo (April 1967). "MK Spectral Types for 185 Bright Stars". Publications of the Astronomical Society of the Pacific. 79 (467): 102. Bibcode:1967PASP...79..102A. doi:10.1086/128449. eISSN 1538-3873. ISSN 0004-6280.
- ^ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode:1970Priv.........0H.
- ^ a b c 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. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
- ^ a b 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.
- ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361.
- ^ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b 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.
- ^ a b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
- ^ a b 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. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
- ^ Verbunt, F.; van Gent, R. H. (June 2010). "The star catalogue of Hevelius". Astronomy and Astrophysics. 516: A29. Bibcode:2010A&A...516A..29V. doi:10.1051/0004-6361/201014003. eISSN 1432-0746. ISSN 0004-6361.
- ^ "HD 27245". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-06-05.
- ^ 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. S2CID 14878976.
- ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711.
- ^ Stebbins, Joel; Huffer, Charles Morse (1930). "The constancy of the light of red stars". Publications of the Washburn Observatory. 15: 140–174. Bibcode:1930PWasO..15..140S.
- ^ Eggen, Olin J. (September 1967). "- and Broad-Band Photometry of Red Stars. Northern Giants". The Astrophysical Journal Supplement Series. 14: 307. Bibcode:1967ApJS...14..307E. doi:10.1086/190158. eISSN 1538-4365. ISSN 0067-0049.
- ^ Pyl'skaja, O. P.; Zakharova, P. E.; Polushina, T. S. (December 1978). "V-R Colours of Red Variable Stars". Information Bulletin on Variable Stars. 1513: 1. Bibcode:1978IBVS.1513....1P. ISSN 0374-0676.
External links