HD 15558

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HD 15558

An H-alpha image of the Heart Nebula. HD 15558 is located at the centre of the cluster, circled.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 02h 32m 42.54s[1]
Declination 61° 27′ 21.58″[1]
Apparent magnitude (V) 7.87[2]
Characteristics
Spectral type O4.5III(f)[3] (O5.5III(f) + O7V[4])
U−B color index -0.55[2]
B−V color index +0.43[2]
V−R color index +0.38[2]
R−I color index +0.40[2]
J−H color index +0.18[2]
Astrometry
Radial velocity (Rv) -45.10±1.50[5] km/s
Proper motion (μ) RA: -1.60±1.50[1] mas/yr
Dec.: -2.50±1.50[1] mas/yr
Parallax (π) 0.97 ± 1.17[1] mas
Distance 7,500[4] ly
(2,300[4] pc)
Details
Mass >152 ± 51[4] M☉
Radius 16.4[6] R☉
Luminosity ~660,000[4] L☉
Surface gravity (log g) 3.7[6] cgs
Temperature 39,500[6] K
Age 0.7-3[4][7] Myr
secondary
Mass 46 ± 11[4] M☉
Radius 5.6[6] R☉
Orbit
Period (P) 442 days[4]
(1.2 [4] yr)
Semi-major axis (a) 726 R☉[4]
Eccentricity (e) 0.37±-0.410.7[4]
Argument of periastron (ω)
(secondary)		 120[4]°
Other designations
HD 15558, HIP 11832, SAO 12326, IDS 02251+6101, TYC 4046-44-1, UBV 2530, GCRV 1424, UBV M 38627, 2MASS J02324253+6127215, WDS J02327+6127, PPM 13720, BD+60 502, GSC 04046-00044, CCDM J02327+6127, IC 1805 148
Database references
SIMBAD data

HD 15558 (HIP 11832) is a massive O-type multiple star system in the constellation of Cassiopeia. It is located in the Heart Nebula in open cluster IC 1805. The primary is a very massive star with 152 M☉ and 660,000 L☉.

Physical characteristics

HD 15558 A is a spectroscopic binary system containing at least two massive luminous class O stars. The primary is an O4.5 giant star with a surface temperature over 46,800 K. It has a mass of 152 M☉ and a luminosity of 660,000 L☉. The star loses 1.5×10−5 M☉ per year.[7] The secondary is an O7V star. It has a mass of 46 M☉. The primary may itself be a double star, suggested by the improbably large mass found from the binary orbit when compared to the other stellar parameters.[4]

The Washington Double Star Catalog lists 11 companions with one arc minute of HD 15558 A, all fainter than 10th magnitude. In addition, it lists component E just over one arc minute away; it is another hot massive star, the 9th magnitude BD+60°501 with a spectral type of O7 V(n)((f))z.[3][8]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 4.12 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 6.2 6.3 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.

Coordinates: Sky map 02h 32m 42.54s, 61° 27′ 21.58″

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