HD 25291

HD 25291, also known as HR 1242, is a solitary,^[12] yellowish-white hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.12,^[2] making it one of the brighter members of this generally faint constellation. The object is relatively far at a distant of approximately 2,100 light years^[1] but is drifting closer with a heliocentric radial velocity of −20.3 km/s.^[5]

HD 25291

location of HD 25291 in red
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Camelopardalis
Right ascension	04h 04m 27.16294s[1]
Declination	+59° 09′ 19.8327″[1]
Apparent magnitude (V)	5.12[2]
Characteristics
Spectral type	F0 II[3]
U−B color index	+0.47[2]
B−V color index	+0.15[2]
Variable type	constant[4]
Astrometry
Radial velocity (Rv)	−20.3±0.8[5] km/s
Proper motion (μ)	RA: −3.380 mas/yr[1] Dec.: +1.027 mas/yr[1]
Parallax (π)	1.5558 ± 0.1047 mas[1]
Distance	2,100 ± 100 ly (640 ± 40 pc)
Absolute magnitude (MV)	−3.91[6]
Details
Mass	8.78±0.65[7] M☉
Radius	50.1[8] R☉
Luminosity (bolometric)	9,878[7] L☉
Surface gravity (log g)	1.87[9] cgs
Temperature	7,425[7] K
Metallicity [Fe/H]	−0.07[9] dex
Rotational velocity (v sin i)	6.8±2[10] km/s
Age	32[9] Myr
Other designations
AG+59°399, BD+58°690, FK5 2290, GC 4858, HD 25291, HIP 19018, HR 1242, SAO 24384[11]
Database references
SIMBAD	data

HD 25291 has a general stellar classification of F0 II,^[3] which indicates that it is an evolved early F-type bright giant. It has also been given a class of F2 Ia,^[13] instead suggesting a slightly cooler and more luminous supergiant. Nevertheless, it has 8.8 times the mass of the Sun^[7] but at an age of 32 million years,^[9] it has expanded to 50.1 times its girth.^[8] It radiates at a bolometric luminosity 9,878 times greather that of the Sun from its enlarged photosphere at an effective temperature of 7,425 K.^[7] HD 25291 is slightly metal deficient, with an iron abundance 85% of solar levels.^[9] It spins modestly with a projected rotational velocity of 6.8 km/s.^[9]

Tetzlaff et al. (2011) found the object to be a runaway star with a peculiar velocity of 25.7+1.9
−4.1 km/s, which is high compared to neighboring stars.^[14]

References

1. 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.
2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D.
3. Gray, R. O.; Napier, M. G.; Winkler, L. I. (April 2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148–2158. Bibcode:2001AJ....121.2148G. doi:10.1086/319956. ISSN 0004-6256.
4. Adelman, S. J.; Cay, I. H.; Cay, M. T.; Kocer, D. (September 2000). "On the Variability of A6 to F9 Supergiants". Information Bulletin on Variable Stars. 4947: 1. Bibcode:2000IBVS.4947....1A. ISSN 0374-0676.
5. Gontcharov, G. A. (November 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
6. 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.
7. Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349–360. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. eISSN 1521-3994. ISSN 0004-6337. S2CID 111387483.
8. 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.
9. Lyubimkov, Leonid S.; Lambert, David L.; Korotin, Sergey A.; Rachkovskaya, Tamara M.; Poklad, Dmitry B. (8 December 2014). "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society. 446 (4): 3447–3460. arXiv:1411.2722. Bibcode:2015MNRAS.446.3447L. doi:10.1093/mnras/stu2299. eISSN 1365-2966. ISSN 0035-8711.
10. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
11. "HR 1242". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 14, 2022.
12. 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.
13. Hardorp, J.; Rohlfs, K.; Slettebak, A.; Stock, J. (1959). "Luminous stars in the Northern Milky Way. Part I.". Hamburger Sternw. Warner & Swasey Obs. C01: 0. Bibcode:1959LS....C01....0H.
14. 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.