DL Crucis
 
| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 14m 16.9255s[1] |
| Declination | −64° 24′ 30.662″[1] |
| Apparent magnitude (V) | 6.261[2] (6.24 - 6.28[3]) |
| Characteristics | |
| Spectral type | B1.5Ia[4] |
| U−B color index | −0.73[5] |
| B−V color index | 0.12[5] |
| Variable type | Alpha Cygni[2] |
| Astrometry | |
| Radial velocity (Rv) | -10.50[6] km/s |
| Proper motion (μ) | RA: -5.62[1] mas/yr Dec.: 0.15[1] mas/yr |
| Parallax (π) | 0.68 ± 0.38[1] mas |
| Distance | approx. 5,000 ly (approx. 1,500 pc) |
| Details | |
| Mass | 30[4] M☉ |
| Radius | 40.7[7] R☉ |
| Luminosity | 242,000[7] L☉ |
| Surface gravity (log g) | 2.50[4] cgs |
| Temperature | 20,100[4] K |
| Rotational velocity (v sin i) | 43[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
DL Crucis is a variable star in the constellation Crux. It is a blue-white supergiant of spectral type B1.5Ia, with a radius around 40 times and a mass 30 times that of the Sun. An Alpha Cygni variable, it ranges between apparent magnitudes 6.24 and 6.28 over a period of roughly 2 days 21 hours.[2] Hence it is just visible with the unaided eye in an outer suburban/rural transition sky.[8]
References
- 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- 1 2 3 Lefèvre, L.; Marchenko, S. V.; Moffat, A. F. J.; Acker, A. (2009). "A systematic study of variability among OB-stars based on HIPPARCOS photometry". Astronomy and Astrophysics 507 (2): 1141–1201. Bibcode:2009A&A...507.1141L. doi:10.1051/0004-6361/200912304. ISSN 0004-6361.
- ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1: 02025. Bibcode:2009yCat....102025S.
- 1 2 3 4 5 Fraser, M.; Dufton, P. L.; Hunter, I.; Ryans, R. S. I. (2010). "Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants". Monthly Notices of the Royal Astronomical Society 404: 1306. arXiv:1001.3337. Bibcode:2010MNRAS.404.1306F. doi:10.1111/j.1365-2966.2010.16392.x. ISSN 0035-8711.
- 1 2 Schild, R. E.; Garrison, R. F.; Hiltner, W. A. (1983). "UBV photometry for southern OB stars". The Astrophysical Journal Supplement Series 51: 321. Bibcode:1983ApJS...51..321S. doi:10.1086/190852. ISSN 0067-0049.
- ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737.
- 1 2 Lamers, Henny J. G. L. M.; Snow, Theodore P.; Lindholm, Douglas M. (1995). "Terminal Velocities and the Bistability of Stellar Winds". The Astrophysical Journal 455: 269. Bibcode:1995ApJ...455..269L. doi:10.1086/176575. ISSN 0004-637X.
- ↑ Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 28 June 2014.
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