HD 15558

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 42.537s[1]
Declination 61° 27′ 21.57″[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: −0.478[1] mas/yr
Dec.: −0.849[1] mas/yr
Parallax (π)0.5764 ± 0.0662 mas[1]
Distanceapprox. 5,700 ly
(approx. 1,700 pc)
Orbit
Period (P)442 days[4]
(1.2 [4] yr)
Semi-major axis (a)726 R☉[4]
Eccentricity (e)0.37±0.07[4]
Argument of periastron (ω)
(secondary)		120[4]°
Details
Mass>152±51[4] M☉
Radius16.4[6] R☉
Luminosity~660,000[4] L☉
Surface gravity (log g)3.7[6] cgs
Temperature39,500[6] K
Age0.7-3[4][7] Myr
secondary
Mass46±11[4] M☉
Radius5.6[6] R☉
Other designations
HD 15558, HIP 11832, SAO 12326, IDS 02251+6101, TYC 4046-44-1, UBV 2530, GCRV 1424, 2MASS J02324253+6127215, WDS J02327+6127, PPM 13720, BD+60°502, GSC 04046-00044, CCDM J02327+6127, IC 1805 148
Database references
SIMBADdata
HD 15558 in the cluster IC 1805

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

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e f 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.
  3. ^ Sota, A.; Mainz Apellantiz, J.; Morrell, N.L; Barba, R.H; Walborn, N.R; et al. (2014). "The Galactic O-star spectroscopic survey (GOSSS). II. Bright southern stars". The Astrophysical Journal Supplement. 211 (1): 10. arXiv:1312.6222. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. S2CID 118847528.
  4. ^ a b c d e f g h i j De Becker, M.; Rauw, G.; Manfroid, J.; Eenens, P. (2006). "Early-type stars in the young open cluster IC 1805. II. The probably single stars HD 15570 and HD 15629, and the massive binary/triple system HD 15558". Astronomy & Astrophysics. 456 (3): 1121. arXiv:astro-ph/0606379. Bibcode:2006A&A...456.1121D. doi:10.1051/0004-6361:20065300. S2CID 16519684.[permanent dead link]
  5. ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy & Astrophysics. 424 (2): 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID 119387088.
  6. ^ a b c d Hillwig, T. C.; Gies, D. R.; Huang, W.; McSwain, M. V.; Wingert, D. W. (2006). "Binary and Multiple O-Type Stars in the Cassiopeia OB6 Association". The Astrophysical Journal. 639 (2): 1069–1080. arXiv:astro-ph/0512407. Bibcode:2006ApJ...639.1069H. doi:10.1086/499771. S2CID 119451956.
  7. ^ Garmany, C. D.; Massey, P. (1981). "HD 15558 - an extremely luminous O-type binary star". Publications of the Astronomical Society of the Pacific. 93: 500. Bibcode:1981PASP...93..500G. doi:10.1086/130866. S2CID 121457874.