15 Canis Majoris
|
Observation data
Epoch J2000.0 Equinox J2000.0
|
| Constellation
|
Canis Major
|
| Right ascension
|
06h 53m 32.907s[2]
|
| Declination
|
−20° 13′ 27.32″[2]
|
| Apparent magnitude (V)
|
+4.79 – 4.84[3]
|
| Characteristics
|
| Spectral type
|
B1IV[4]
|
| U−B color index
|
−0.96[5]
|
| B−V color index
|
−0.212±0.013[6]
|
| Variable type
|
β Cep[7][3]
|
| Astrometry |
|---|
|
|---|
| Radial velocity (Rv) | 28.00[8] km/s |
| Proper motion (μ) | RA: −5.46±0.16[2] mas/yr
Dec.: +3.58±0.17[2] mas/yr |
| Parallax (π) | 2.68±0.24 mas[2] |
| Distance | 1,200 ± 100 ly
(370 ± 30 pc) |
| Absolute magnitude (MV) | −3.02[6] |
|
|---|
| Details[7] |
|---|
|
|---|
| Mass | 12.8±1.2 M☉ |
| Radius | 6.8±1.2 R☉ |
| Luminosity | 20,000+12,000
−7,400 L☉ |
| Surface gravity (log g) | 3.89±0.20 cgs |
| Temperature | 26,100±1,200 K |
| Rotational velocity (v sin i) | 20±12 km/s |
|
|---|
| Other designations |
|---|
| 15 CMa, EY CMa, BD−20°1616, FK5 2532, GC 9034, HD 50707, HIP 33092, HR 2571, SAO 172520[9] |
| Database references |
|---|
| SIMBAD | data |
15 Canis Majoris is a variable star in the southern constellation of Canis Major,[9] located roughly 1,200 light years away from the Sun.[2] It has the variable star designation EY Canis Majoris; 15 Canis Majoris is the Flamsteed designation. The star is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of +4.8. It is moving away from the Earth with a heliocentric radial velocity of 28 km/s.[8]
This is a B-type star with a stellar classification of B1 IV.[4] Merle F. Walker discovered that 15 Canis Majoris is a variable star in 1955, and he published that discovery in 1956.[10] It is classified as a Beta Cephei type variable star and its brightness varies from magnitude +4.79 down to +4.84 with a period of 4.430 h.[3] The star has 12.8 times the mass of the Sun and 6.8 times the Sun's radius. It is radiating 20,000 times the luminosity of the Sun from its photosphere at an effective temperature of 26,100 K.[7]
References
- ^ Heynderickx, D. (December 1992). "A photometric study of beta Cephei stars. I. Frequency analyses". Astronomy & Astrophysics Supplement Series. 96: 207–254. Bibcode:1992A&AS...96..207H.
- ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ a b De Burgos, A.; Simón-Díaz, S.; Urbaneja, M. A.; Negueruela, I. (2023). "The IACOB project. IX. Building a modern empirical database of Galactic O9 - B9 supergiants: Sample selection, description, and completeness". Astronomy and Astrophysics. 674: A212. arXiv:2305.00305. Bibcode:2023A&A...674A.212D. doi:10.1051/0004-6361/202346179.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b c Hubrig, S.; et al. (January 2009), "New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars", Astronomische Nachrichten, 330 (4): 317, arXiv:0902.1314, Bibcode:2009AN....330..317H, doi:10.1002/asna.200811187, S2CID 17497112
- ^ a b Gontcharov, G. A. (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. S2CID 119231169.
- ^ a b "15 CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 30, 2019.
- ^ Walker, Merle F. (April 1956). "The Light Variability of 15 Canis Majoris". Publications of the Astronomical Society of the Pacific. 68 (401): 154–157. Bibcode:1956PASP...68..154W. doi:10.1086/126903.
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