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) | 6.238[1] |
| Characteristics | |
| Spectral type | B1.5Ia[1] |
| U−B color index | ? |
| B−V color index | ? |
| Variable type | Alpha Cygni |
| Astrometry | |
| Radial velocity (Rv) | -10.50[1] km/s |
| Proper motion (μ) | RA: -5.62[1] mas/yr Dec.: 0.15 [1] mas/yr |
| Parallax (π) | 0.68 ± 0.38 mas |
| Distance | approx. 5,000 ly (approx. 1,500 pc) |
| Absolute magnitude (MV) | -7.66 |
| Details | |
| Mass | 24 [2] M☉ |
| Radius | 40.7 [2] R☉ |
| Temperature | 19700 [2] K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
DL Crucis is a variable star in the constellation Crux. It is a blue-white supergiant of spectral type B1.5Ia,[1] with a radius around 40.7 times and a mass 24 times that of the Sun.[2] An Alpha Cygni variable, it ranges between apparent magnitudes 6.24 and 6.28 over a period of roughly 2 days 21 hours.[3] Hence it is just visible with the unaided eye in an outer suburban/rural transition sky.[4] Its bolometric magnitude has been calculated at -8.66.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 SIMBAD DL Crucis.
- ↑ 2.0 2.1 2.2 2.3 2.4 Lamers 1995.
- ↑ AAVSO DL Crucis.
- ↑ Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. Retrieved 28 June 2014.
- Watson, Christopher (4 January 2010). "DL Crucis". AAVSO Website. American Association of Variable Star Observers. Retrieved 28 June 2014.
- "V* DL Cru -- Pulsating variable Star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 4 September 2012.
- Lamers, Henny J. G. L. M.; Snow, Theodore P.; Lindholm, Douglas M. (1995). "Terminal Velocities and the Bistability of Stellar Winds". Astrophysical Journal 455: 269. Bibcode:1995ApJ...455..269L. doi:10.1086/176575.
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