HH Carinae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 53m 36.67s[1] |
| Declination | −59° 27′ 17.8″[1] |
| Apparent magnitude (V) | 10.3 – 10.82[2] |
| Characteristics | |
| Apparent magnitude (U) | 10.13[3] |
| Apparent magnitude (B) | 10.79±0.99[4] |
| Apparent magnitude (G) | 10.22±0.01[1] |
| Apparent magnitude (R) | 10.37±0.05[4] |
| Apparent magnitude (J) | 9.28±0.03[5] |
| Apparent magnitude (H) | 9.12±0.04[5] |
| Apparent magnitude (K) | 8.92±0.03[5] |
| Variable type | EA/DM[2] |
| Primary | |
| Spectral type | O9 V[6] |
| Secondary | |
| Spectral type | B0 III–IV[6] |
| Astrometry | |
| Total velocity | 127+17 −17[6] km/s |
| Proper motion (μ) | RA: −5.339±0.016[1] mas/yr Dec.: 2.559±0.015[1] mas/yr |
| Parallax (π) | 0.2274±0.0146[1] mas |
| Distance | 4654±795[6] pc |
| Primary | |
| Absolute magnitude (MV) | −3.10±0.19[6] |
| Absolute bolometric magnitude (Mbol) | −6.32±0.15[6] |
| Secondary | |
| Absolute magnitude (MV) | −4.24±0.88[6] |
| Absolute bolometric magnitude (Mbol) | −6.90±0.23[6] |
| Position (relative to Primary)[6] | |
| Component | Secondary |
| Observed separation (projected) | 0.129±0.004 AU {{{projsepref}}} |
| Orbit[6] | |
| Period (P) | 3.231515 d |
| Inclination (i) | 80.90±0.09° |
| Semi-amplitude (K1) (primary) | 161±4 km/s |
| Semi-amplitude (K2) (secondary) | 268±9 km/s |
| Details[6] | |
| Primary | |
| Mass | 17.2±1.2 M☉ |
| Radius | 4.86±0.18 R☉ |
| Luminosity | 4.347±0.052 L☉ |
| Surface gravity (log g) | 4.30±0.06 cgs |
| Temperature | 33500±2500 K |
| Rotational velocity (v sin i) | 220±30 km/s |
| Secondary | |
| Mass | 10.3±0.9 M☉ |
| Radius | 9.35±0.31 R☉ |
| Luminosity | 4.574±0.036 L☉ |
| Surface gravity (log g) | 3.51±0.07 cgs |
| Temperature | 27500±2500 K |
| Rotational velocity (v sin i) | 150±5 km/s |
| Other designations | |
HH Car, HD 303503, ALS 2008, AN 197.1937, CPD-58 2839, CPD-58 2840, GEN# -0.05802840, GEN# +1.00303503, Hen 3-516, LLNS 3217, LS 2008, SBC9 644, TYC 8627-2390-1, UBV M 29272, UCAC4 153-058535, uvby98 100303503, WEB 9674 | |
| Database references | |
| SIMBAD | data |
HH Carinae is a spectroscopic binary in the constellation of Carina. It consists of an O-type main-sequence star and a blue giant or subgiant.[6]
Star system
HH Carinae consists of two stars with respective spectral types of O9 V and B0 III–IV. The less massive B-type component is tidally locked to the more massive O-type component.[6]
Primary
The primary has a rotational velocity of 220 km s-1, approximately three times faster than the synchronous rotational velocity. This is attributed to roche lobe overflow from the secondary, which speeds up the primary's rotation. It is smaller, less luminous but more massive than the secondary.[6]
Secondary
The secondary has filled its roche lobe and is tidally locked to the primary. It having left the main-sequence indicates that it has lost a significant amount of mass. It is estimated to lose mass at a rate of approximately 1×10−6 M☉ yr-1.[6]
Circumstellar envelope
The system is surrounded by a circumstellar envelope, identifiable due to a double peak in Hα emission, with an effective temperature of 22000±3000 K. It is heterogeneous as its temperature and density vary slightly, likely due to interaction between stellar winds and matter transferred from the secondary to the L1 point. The inner shell has a radius of 27.8±1.3 R☉ and the outer shell has one of 32.2±2.2 R☉.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 "Gaia DR3 5338423042200185472". vizier.cds.unistra.fr. Retrieved 2026-06-15.
- ↑ 2.0 2.1 "HH Car". vsx.aavso.org. Retrieved 2026-06-15.
- ↑ Reed, B. Cameron (21 January 2003). "Catalog of Galactic OB Stars". The Astronomical Journal. 125 (5): 2531–2533. Bibcode:2003AJ....125.2531R. doi:10.1086/374771.
- ↑ 4.0 4.1 "UCAC4 153-058535". vizier.cds.unistra.fr. Retrieved 2026-06-15.
- ↑ 5.0 5.1 5.2 "2MASS J10533666-5927178". vizier.cds.unistra.fr. Retrieved 2026-06-15.
- ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 6.10 6.11 6.12 6.13 6.14 6.15 Bakıș, H.; Köseoglu, D. T.; Bakıș, V.; Nitschelm, C.; Eker, Z. (22 February 2021). "Physical modelling of the circumstellar material in the early-type active binary HH Carinae". Monthly Notices of the Royal Astronomical Society. 503 (2): 2432–2443. Bibcode:2021MNRAS.503.2432B. doi:10.1093/mnras/stab560.
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