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☉.
| 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] |
| Distance | approx. 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☉ |
| 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☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Physical characteristics
editHD 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☉, making it one of the most massive stars in the Milky Way Galaxy. 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 within 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
editReferences
edit- ^ 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.
- ^ 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.
- ^ a b 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.
- ^ a b c d e f g h i j k 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]
- ^ 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.
- ^ 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.
- ^ a b 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.
- ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.