HD 54879
Location of HD 54879 (circled) | |
| Observation data Epoch J2000.0[1] Equinox J2000.0[1] | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 07h 10m 08.14876s |
| Declination | −11° 48′ 09.8389″ |
| Apparent magnitude (V) | 7.65[2] |
| Characteristics | |
| Evolutionary stage | O9.7V[3] |
| U−B color index | −0.80[2] |
| B−V color index | −0.05[2] |
| J−H color index | −0.037[2] |
| J−K color index | −0.079[2] |
| Astrometry | |
| Radial velocity (Rv) | 34.46±0.27[4] km/s |
| Proper motion (μ) | RA: −2.808[1] mas/yr Dec.: 1.270[1] mas/yr |
| Parallax (π) | 0.799 ± 0.0347[1] mas |
| Distance | 4,100 ± 200 ly (1,250 ± 50 pc) |
| Details[5] | |
| Mass | 14±7 M☉ |
| Radius | 6.1±1.5 R☉ |
| Luminosity | 28200+16500 −10400 L☉ |
| Surface gravity (log g) | 4.0±0.1 cgs |
| Temperature | 30500±500 K |
| Age | 5±1 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 54879 is a bluish-hued star in the southern constellation of Canis Major, close to the border with Monoceros. It is too faint to be seen by the naked eye, having an apparent magnitude of 7.65, but can be readily observed using a pair of binoculars.[6] The star is located some 4,100 light-years (1,300 pc)* distant according to Gaia EDR3 parallax measurements, and is moving away from the Solar System at a heliocentric radial velocity of 34.46 km/s.
Description
This is an O-type main-sequence star with a stellar classification of O9.7V, indicating that it is near the border between the spectral types O and B. It radiates 28,200 times the luminosity of the Sun from its photosphere at an effective temperature of 30,500 K (30,200 °C; 54,400 °F), over five times hotter than the Sun. Its mass and radius are not well-constrained due to uncertainties in the star's distance, but simulations show that it likely formed with a mass of 16 ± 1 M☉ about 5 million years ago.[5]
See also
References
- ↑ 1.0 1.1 1.2 1.3 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. Unknown parameter
|s2cid=ignored (help) Gaia EDR3 record for this source at VizieR. - ↑ 2.0 2.1 2.2 2.3 2.4 2.5 "HD 54879". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-11-02.
- ↑ Järvinen, S P; Hubrig, S; Schöller, M; et al. (2021-12-23). "Detection of anomalous element distribution in the extremely slowly rotating magnetic O9.7 V star HD 54879". Monthly Notices of the Royal Astronomical Society. Oxford University Press (OUP). 510 (3): 4405–4419. doi:10.1093/mnras/stab3720. ISSN 0035-8711.
- ↑ Boyajian, T. S.; Gies, D. R.; Baines, E. K.; et al. (2007). "Radial Velocities of Six OB Stars". Publications of the Astronomical Society of the Pacific. IOP Publishing. 119 (857): 742–746. doi:10.1086/520707. ISSN 0004-6280.
- ↑ 5.0 5.1 Shenar, T.; Oskinova, L. M.; Järvinen, S. P.; et al. (2017). "A combined HST and XMM-Newton campaign for the magnetic O9.7 V star HD 54879". Astronomy & Astrophysics. EDP Sciences. 606: A91. doi:10.1051/0004-6361/201731291. ISSN 0004-6361.
- ↑ Zarenski, Ed (2004). "Limiting Magnitude in Binoculars" (PDF). Cloudy Nights. Archived from the original (PDF) on 21 July 2011. Retrieved 6 May 2011. Unknown parameter
|url-status=ignored (help)
- Castro, N.; Fossati, L.; Hubrig, S.; et al. (2015-07-10). "B fields in OB stars (BOB). Detection of a strong magnetic field in the non-peculiar O9.7V star HD 54879". Astronomy & Astrophysics. EDP Sciences. doi:10.1051/0004-6361/201425354. ISSN 0004-6361.
- Hubrig, S; Küker, M; Järvinen, S P; et al. (2019-01-18). "A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879". Monthly Notices of the Royal Astronomical Society. Oxford University Press (OUP). 484 (4): 4495–4506. doi:10.1093/mnras/stz198. ISSN 0035-8711.
- Wade, G A; Bagnulo, S; Keszthelyi, Z; et al. (2019-11-20). "No evidence of a sudden change of spectral appearance or magnetic field strength of the O9.7V star HD 54879". Monthly Notices of the Royal Astronomical Society: Letters. Oxford University Press (OUP). 492 (1): L1–L5. doi:10.1093/mnrasl/slz174. ISSN 1745-3925.
- Hubrig, S; Järvinen, S P; Schöller, M; et al. (2019-10-31). "The very slow rotation of the magnetic O9.7 V star HD 54879". Monthly Notices of the Royal Astronomical Society. Oxford University Press (OUP). 491 (1): 281–288. doi:10.1093/mnras/stz3046. ISSN 0035-8711.
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