MY Camelopardalis

MY Camelopardalis (MY Cam) is a binary star system located in the Alicante 1 open cluster, some 13 kly (4.0 kpc) away in the constellation Camelopardalis. It is one of the most massive known binary star systems and a leading candidate for a massive star merger. MY Cam is the brightest star in Alicante 1.[5]

"MY Cam" redirects here. For the iOS app, see My Cam.
MY Camelopardalis
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Camelopardalis
Right ascension 03h 59m 18.2863s[1]
Declination +57° 14′ 13.673″[1]
Apparent magnitude (V) 9.80 - 10.15[2]
Characteristics
Spectral type O6nn[3] (O6V((f)) + O6V((f))[4])
U−B color index −0.66[3]
B−V color index +0.28[3]
Variable type Ellipsoidal[2]
Astrometry
Radial velocity (Rv)−47[5] km/s
Proper motion (μ) RA: −2.3[6] mas/yr
Dec.: −0.3[6] mas/yr
Parallax (π)0.1333 ± 0.0789[7] mas
Distance~4,000[5] pc
Absolute magnitude (MV)−4.1[3]
Orbit[5]
Period (P)1.175 days
Semi-major axis (a)19.24 R☉
Eccentricity (e)0
Inclination (i)62.59°
Argument of periastron (ω)
(secondary)		90°
Argument of periastron (ω)
(primary)		270°
Semi-amplitude (K1)
(primary)		335 km/s
Semi-amplitude (K2)
(secondary)		400 km/s
Details[5]
A
Mass37.7 M☉
Radius7.60 R☉
Surface gravity (log g)4.251 cgs
Temperature42,000 ± 1,500 K
Rotational velocity (v sin i)290 km/s
B
Mass31.6 M☉
Radius7.01 R☉
Surface gravity (log g)4.245 cgs
Temperature39,000 ± 1,500 K
Rotational velocity (v sin i)268 km/s
Other designations
MY Camelopardalis, BD+56°864, Alicante 1 NM 693, 2MASS J03591829+5714137, Gaia DR2 469715181320008960
Database references
SIMBADdata

The system consists of two hot blue O-type stars with one component having a mass of 32 solar masses and the other 38 solar masses. MY Cam is a contact binary and eclipsing binary, with an orbital period of 1.2 days, and an orbital velocity of 1,000,000 km/h (620,000 mph).[5]

References
  1. Hog, E.; Kuzmin, A.; Bastian, U.; Fabricius, C.; Kuimov, K.; Lindegren, L.; Makarov, V. V.; Roeser, S. (1998). "The TYCHO Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
  2. Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2008). "The 79th Name-List of Variable Stars". Information Bulletin on Variable Stars. 5863: 1. Bibcode:2008IBVS.5863....1K.
  3. Haug, U. (1970). "UBV Observations of luminous stars in three Milky Way fields (Cassiopeia, Camelopardalis and Gemini)". Astronomy & Astrophysics Supplement Series. 1 (1): 35. Bibcode:1970A&AS....1...35H.
  4. Greaves, John; Wils, Patrick (2004). "NSV 15852 is likely an Elliptical Variable akin in type to AO Cas". Information Bulletin on Variable Stars. 5517: 1. Bibcode:2004IBVS.5517....1G.
  5. Lorenzo, J.; Negueruela, I.; Val Baker, A. K. F.; García, M.; Simón-Díaz, S.; Pastor, P.; Méndez Majuelos, M. (2014). "MY Camelopardalis, a very massive merger progenitor". Astronomy & Astrophysics. 572: A110. arXiv:1410.5575v1. Bibcode:2014A&A...572A.110L. doi:10.1051/0004-6361/201424345. S2CID 53743637.
  6. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
  7. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
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