Astronomy:42 Camelopardalis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 06h 50m 57.08877s[1] |
| Declination | +67° 34′ 18.9814″[1] |
| Apparent magnitude (V) | 5.14[2] |
| Characteristics | |
| Spectral type | B4 IV[3] or B5 V[2] |
| B−V color index | −0.152±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | 3.2±1.2[4] km/s |
| Proper motion (μ) | RA: +0.55[5] mas/yr Dec.: +5.02[5] mas/yr |
| Parallax (π) | 4.2456 ± 0.2405[1] mas |
| Distance | 770 ± 40 ly (240 ± 10 pc) |
| Absolute magnitude (MV) | −2.10[2] |
| Details | |
| Mass | 6.5±0.2[6] M☉ |
| Radius | 5.6[7] R☉ |
| Luminosity (bolometric) | 2,460[8] L☉ |
| Temperature | 16,550[8] K |
| Rotational velocity (v sin i) | 105[9] km/s |
| Age | 50.1±11.7[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
42 Camelopardalis is a single[11] star in the constellation Camelopardalis,[10] located roughly 770 light years away from the Sun.[1] It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.14.[2] The visual magnitude of the star is diminished by an extinction of 0.22 due to interstellar dust.[12] It is moving further from the Earth with a heliocentric radial velocity of 3 km/s.[4] 42 Camelopardalis has a peculiar velocity of 24.4+1.9
−2.1 km/s and may be a runaway star.[6]
Observations made in 1933 appeared to suggest this could be a Beta Cephei variable,[13] but this was not confirmed by follow-up measurements.[14] The star has a stellar classification of B4 IV,[3] matching a B-type subgiant star. It has 6.5[6] times the mass of the Sun and about 5.6[7] times the Sun's radius. 42 Camelopardalis is 50[6] million years old with a high rotation rate, showing a projected rotational velocity of 105 km/s.[9] It is radiating 2,460[8] times the luminosity of the Sun from its photosphere at an effective temperature of 16,550 K.[8] This star is notable as demonstrating similarities between the short-period B-type variables and the Cepheid variables.[citation needed]
References
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement 17: 371, doi:10.1086/190179, Bibcode: 1968ApJS...17..371L
- ↑ 4.0 4.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 5.0 5.1 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 6.0 6.1 6.2 6.3 6.4 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.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 8.2 8.3 Hohle, M. M. et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, Bibcode: 2010AN....331..349H.
- ↑ 9.0 9.1 Strom, Stephen E. et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal 129 (2): 809–828, doi:10.1086/426748, Bibcode: 2005AJ....129..809S.
- ↑ 10.0 10.1 "42 Cam". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=42+Cam.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G.
- ↑ Edwards, D. L. (1933), "Variations in the Spectrum of 42 Camelopardalis", Monthly Notices of the Royal Astronomical Society 93 (9): 729–735, doi:10.1093/mnras/93.9.729, Bibcode: 1933MNRAS..93..729E.
- ↑ Heard, John F. (March 1949), "An Analysis of Radial-Velocity Measures of Eight Stars Formerly Assigned to the Beta Cephei Group.", Astrophysical Journal 109: 185, doi:10.1086/145122, Bibcode: 1949ApJ...109..185H.
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