HD 48099

HD 48099
	Location of JD 48099 (circled)
Observation data; EpochJ2000EquinoxJ2000
Constellation	Monoceros
Right ascension	06h41m59.2309s
Declination	+06° 20′ 43.531″
Apparent magnitude(V)	6.37
Characteristics
Spectral type	O5.5V((f)) + O9V
U−Bcolor index	−0.94
B−Vcolor index	−0.05
Astrometry
Radial velocity(Rv)	+1.30km/s
Proper motion(μ)	RA:0.84mas/yr; Dec.:2.55mas/yr
Parallax(π)	1.17 ± 0.41mas
Distance	1829pc
Absolute magnitude(MV)	−5.6
Orbit
Period(P)	3.0786 days
Semi-major axis(a)	~33R☉
Eccentricity(e)	0.0
Inclination(i)	16°
Semi-amplitude(K1); (primary)	54.4 km/s
Semi-amplitude(K2); (secondary)	96.2 km/s
Details
Mass	55M☉
Radius	11.6R☉
Luminosity	450,000L☉
Surface gravity(logg)	4.5cgs
Temperature	44,000K
Rotational velocity(vsini)	330 km/s
secondary
Mass	19M☉
Radius	6.5R☉
Luminosity	40,000L☉
Surface gravity(logg)	3.5cgs
Temperature	32,000K
Rotational velocity(vsini)	185 km/s
Other designations
	HR2467,HD48099,HIP32067,SAO114293,BD+06°1351
Database references
SIMBAD	data

HD 48099is aspectroscopic binaryin theconstellation Monoceroswhere both components are massive and luminousO 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.^[3]

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.^[5]

References

^^a ^b ^c ^d ^eVan 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.
^^a ^b ^cDucati, 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.
^^a ^b ^c ^dMahy, 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.
^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.
^^a ^bBrown, 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.
^Hutchings, J. B. (1976). "Spectroscopic measurements of OB supergiants".Publications of the Dominion Astrophysical Observatory Victoria.14:355.Bibcode:1976PDAO...14..355H.

[hipparcos-1] 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.

[ducati-2] 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.

[mahy-3] 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.

[4] 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.

[brown-5] 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.

[6] Hutchings, J. B. (1976). "Spectroscopic measurements of OB supergiants".Publications of the Dominion Astrophysical Observatory Victoria.14:355.Bibcode:1976PDAO...14..355H.

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Observation data EpochJ2000EquinoxJ2000
Location of JD 48099 (circled)
Constellation	Monoceros
Right ascension	06^h41^m59.2309^s^[1]
Declination	+06° 20′ 43.531″^[1]
Apparent magnitude(V)	6.37^[2]
Characteristics
Spectral type	O5.5V((f)) + O9V^[3]
U−Bcolor index	−0.94^[2]
B−Vcolor index	−0.05^[2]
Astrometry

Radial velocity(R_v)	+1.30^[4]km/s
Proper motion(μ)	RA:0.84^[1]mas/yr Dec.:2.55^[1]mas/yr
Parallax(π)	1.17 ± 0.41mas^[1]
Distance	1829^[5]pc
Absolute magnitude(M_V)	−5.6^[6]

Orbit^[3]
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^[3]

Mass	55`M`_☉
Radius	11.6`R`_☉
Luminosity	450,000`L`_☉
Surface gravity(logg)	4.5cgs
Temperature	44,000K
Rotational velocity(vsini)	330 km/s
secondary
Mass	19`M`_☉
Radius	6.5`R`_☉
Luminosity	40,000`L`_☉
Surface gravity(logg)	3.5cgs
Temperature	32,000K
Rotational velocity(vsini)	185 km/s
Other designations
HR2467,HD48099,HIP32067,SAO114293,BD+06°1351
Database references
SIMBAD	data