HD 48099

Last updated
HD 48099
Monoceros constellation map.svg
Red circle.svg
Location of JD 48099 (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Monoceros [1]
Right ascension 06h 41m 59.2309s [2]
Declination +06° 20 43.531 [2]
Apparent magnitude  (V)6.37 [3]
Characteristics
Spectral type O5.5V((f)) + O9V [4]
U−B color index 0.94 [3]
B−V color index 0.05 [3]
Astrometry
Radial velocity (Rv)+1.30 [5] km/s
Proper motion (μ)RA: 0.84 [2] mas/yr
Dec.: 2.55 [2] mas/yr
Parallax (π)1.17±0.41  mas [2]
Distance 1829 [6]   pc
Absolute magnitude  (MV)5.6 [7]
Orbit [4]
Period (P)3.0786 days
Semi-major axis (a)~33 R
Eccentricity (e)0.0
Inclination (i)16°
Semi-amplitude (K1)
(primary)
54.4 km/s
Semi-amplitude (K2)
(secondary)
96.2 km/s
Details [4]
Mass 55  M
Radius 11.6  R
Luminosity 450,000  L
Surface gravity (log g)4.5  cgs
Temperature 44,000  K
Rotational velocity (v sin i)330 km/s
secondary
Mass 19  M
Radius 6.5  R
Luminosity40,000  L
Surface gravity (log g)3.5  cgs
Temperature 32,000  K
Rotational velocity (v sin i)185 km/s
Other designations
HR  2467, HD  48099, HIP  32067, SAO  114293, BD+06°1351
Database references
SIMBAD data

HD 48099 is a spectroscopic binary in the constellation Monoceros where both components are massive and luminous O stars.

Binary stars offer the opportunity to directly measure the mass of each component, but in the case the orbital inclination is very low and the masses cannot be accurately determined. The stars are orbiting extremely close together, separated only by about the diameters of the stars themselves. They complete one orbit in just over three days. [4]

Although HD 48099 only has a moderate space velocity of 37.7 km/s, it has produced a bow shock 2.26 parsecs from the star itself. [6]

References

  1. Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 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.
  3. 1 2 3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  4. 1 2 3 4 Mahy, L.; Rauw, G.; Martins, F.; Nazé, Y.; Gosset, E.; De Becker, M.; Sana, H.; Eenens, P. (2010). "A New Investigation of the Binary Hd 48099". The Astrophysical Journal. 708 (2): 1537–1544. arXiv: 0912.0605 . Bibcode:2010ApJ...708.1537M. doi:10.1088/0004-637X/708/2/1537. S2CID   119205797.
  5. Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv: astro-ph/0406573 . Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID   119387088.
  6. 1 2 Brown, D.; Bomans, D. J. (2005). "To see or not to see a bow shock". Astronomy and Astrophysics. 439 (1): 183–194. arXiv: astro-ph/0505098 . Bibcode:2005A&A...439..183B. doi:10.1051/0004-6361:20041054. S2CID   16735169.
  7. Hutchings, J. B. (1976). "Spectroscopic measurements of OB supergiants". Publications of the Dominion Astrophysical Observatory Victoria. 14: 355. Bibcode:1976PDAO...14..355H.