Astronomy:HD 39225
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 52m 40.09301s[2] |
| Declination | +33° 55′ 02.8663″[2] |
| Apparent magnitude (V) | 5.82–6.07[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M1+III Fe-1[5] |
| U−B color index | 1.97 |
| B−V color index | 1.579±0.021 |
| Variable type | suspected[3] |
| Astrometry | |
| Radial velocity (Rv) | 99.39±0.61[2] km/s |
| Proper motion (μ) | RA: +17.953[2] mas/yr Dec.: +9.174[2] mas/yr |
| Parallax (π) | 4.9537 ± 0.0893[2] mas |
| Distance | 660 ± 10 ly (202 ± 4 pc) |
| Absolute magnitude (MV) | −0.77[1] |
| Details | |
| Mass | 3.7[6] M☉ |
| Radius | 51[7] R☉ |
| Luminosity | 411[7] L☉ |
| Surface gravity (log g) | 1.61[8] cgs |
| Temperature | 3,643[7] K |
| Age | 865[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 39225, also known as HR 2028, is a variable star in the northern constellation Auriga, located around 620 light years away from the Sun. It is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of around 6.[3] This is a suspected runaway star[10] that is moving away from the Sun with a heliocentric radial velocity of 99 km/s.[2]
Currently on the asymptotic giant branch,[4] this is an evolved red giant star with a stellar classification of M1+III Fe-1.[5] The suffix notation indicates an underabundance of iron in the stellar atmosphere compared to similar stars of its class. It is suspected of varying in brightness between magnitudes 5.82 and 6.07.[3] Having exhausted the hydrogen at its core, it has expanded to around 51 times the Sun's radius.[7] It shines with a luminosity approximately 411 times that of the Sun and has a surface temperature of 3,643 K.[7]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Watson, Christopher (18 January 2010). "NSV 2681". The International Variable Star Index. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=41305.
- ↑ 4.0 4.1 Eggen, Olin J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E.
- ↑ 5.0 5.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ Quintana, Alexis L.; Wright, Nicholas J.; Jeffries, Robin D. (2023). "Mapping the distribution of OB stars and associations in Auriga". Monthly Notices of the Royal Astronomical Society 522 (2): 3124. doi:10.1093/mnras/stad1160. Bibcode: 2023MNRAS.522.3124Q.
- ↑ 7.0 7.1 7.2 7.3 7.4 Van Belle, Gerard T.; von Braun, Kaspar; Ciardi, David R.; Pilyavsky, Genady; Buckingham, Ryan S.; Boden, Andrew F.; Clark, Catherine A.; Hartman, Zachary et al. (2021). "Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color". The Astrophysical Journal 922 (2): 163. doi:10.3847/1538-4357/ac1687. Bibcode: 2021ApJ...922..163V.
- ↑ 8.0 8.1 Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K.
- ↑ "HD 39225". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+39225.
- ↑ Tetzlaff, N. et al. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society 410 (1): 190–200. doi:10.1111/j.1365-2966.2010.17434.x. Bibcode: 2011MNRAS.410..190T.
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