V345 Carinae
Template:Short description Script error: No such module "about".
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | +4.66[3] (4.67 to 4.78)[4] |
| Characteristics | |
| Spectral type | B2(IV)n[5] |
| B−V Template:Engvar | Script error: No such module "val".[3] |
| Variable type | Be[6] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[3] km/s |
| Proper motion (μ) | RA: −3.017[2] mas/yr Dec.: +8.394[2] mas/yr |
| Parallax (π) | 3.2440±0.2602 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −2.67[3] |
| Details | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[8] Template:Solar radius |
| Luminosity | 2,539.73[3] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Rotational velocity (v sin i) | Script error: No such module "val".[8] km/s |
| Age | Script error: No such module "val".[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
V345 Carinae is a star in the constellation Carina. It has the Bayer designation E Carinae; V345 Carinae is the variable star designation. The star has a blue-white hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around +4.66.[3] Its actual brightness varies from magnitude +4.67 to +4.78 with a period of 137.7 days.[4] Based on parallax measurements, it is located at a distance of approximately 1,010 light years from the Sun.[2] It is drifting further away with a radial velocity of around +19 km/s.[3]
This star has a stellar classification of B2(IV)n,[5] matching a suspected B-type subgiant star. The 'n' notation indicates "nebulous" lines caused by rapid rotation: the star is spinning with a projected rotational velocity of 140 km/s.[8] It is a Be star having a circumstellar disk of hot, decreted gas that is inserting emission lines into the spectrum.[6] The star is 20[7] million years old with 9.6[7] times the mass of the Sun and 8.7[8] times the Sun's radius. It is radiating 2,540[3] times the luminosity of the Sun from its photosphere at an effective temperature of 19,000 K.[8]
Alan William James Cousins announced that the star's brightness showed signs of variability, in 1959.[10] It was given its variable star designation in 1975.[11] The star displays a complex luminosity variation with a periods of 1.13028 and 137.7 days. Although thought to be a single star,[12] Carrier et al. (2002) suggested the longer period may be caused by some sort of binary interaction with the circumstellar disk or perhaps a light reflecting effect. However, no companion has been detected via radial velocity variations. This suggests that the companion would need to either have less than 1.7 times the mass of the Sun or it is being viewed from nearly pole-on.[13] The short-term variations may be from non-radial pulsations similar to those of ω CMa.[14]
References
<templatestyles src="Reflist/styles.css" />
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c d e f Template:Cite DR2
- ↑ a b c d e f g h Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d e f g Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".