V345 Carinae
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. Its actual brightness varies from magnitude +4.67 to +4.78 with a period of 137.7 days. Based on parallax measurements, it is located at a distance of approximately 1,010 light years from the Sun. It is drifting further away with a radial velocity of around +19 km/s.

This star has a stellar classification of B2(IV)n, 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. It is a Be star having a circumstellar disk of hot, decreted gas that is inserting emission lines into the spectrum. The star is 20 million years old with 9.6 times the mass of the Sun and 8.7 times the Sun's radius. It is radiating 2,540 times the luminosity of the Sun from its photosphere at an effective temperature of 19,000 K.

The star displays a complex luminosity variation with a periods of 1.13028 and 137.7 days. Although thought to be a single star, 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. The short-term variations may be from non-radial pulsations similar to those of ω CMa.
Q523
star
Concept
Q8928
constellation
Concept
Q10470
Carina
CEL
Q105616
Bayer designation
Concept
Q593448
variable star designation
Concept
Q124313
apparent visual magnitude
Concept
Q906561
parallax
Concept
Q531
light year
Concept
Q525
Sun
CEL
Q240105
radial velocity
Concept
Q25377588
stellar classification
Concept
Q25377588
B-type
Concept
Q6227
subgiant star
Concept
Q212111
lines
Concept
Q6464
projected rotational velocity
Concept
Q812800
Be star
Concept
Q212111
emission line
Concept
Q752171
spectrum
Concept
Q180892
mass of the Sun
Concept
Q48440
Sun's radius
Concept
Q843877
luminosity of the Sun
Concept
Q6372
photosphere
Concept
Q854050
effective temperature
Concept
Q180892
mass of the Sun
Concept
Q2281766
ω CMa
CEL
Q3781737
V345 Carinae
CEL
Q3781737
V345 Carinae
CEL
+345^^http://www.w3.org/2001/XMLSchema#decimal
345
NUMBER
+345^^http://www.w3.org/2001/XMLSchema#decimal
345
NUMBER
++4.66^^http://www.w3.org/2001/XMLSchema#decimal
+4.66
NUMBER
++4.67^^http://www.w3.org/2001/XMLSchema#decimal
+4.67
NUMBER
++4.78^^http://www.w3.org/2001/XMLSchema#decimal
+4.78
NUMBER
++19^^http://www.w3.org/2001/XMLSchema#decimal
+19
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+20^^http://www.w3.org/2001/XMLSchema#decimal
20
NUMBER
+9.6^^http://www.w3.org/2001/XMLSchema#decimal
9.6
NUMBER
+8.7^^http://www.w3.org/2001/XMLSchema#decimal
8.7
NUMBER
+1.130^^http://www.w3.org/2001/XMLSchema#decimal
1.130
NUMBER
+28^^http://www.w3.org/2001/XMLSchema#decimal
28
NUMBER
+137.7^^http://www.w3.org/2001/XMLSchema#decimal
137.7
NUMBER
+2002^^http://www.w3.org/2001/XMLSchema#decimal
2002
NUMBER
+1.7^^http://www.w3.org/2001/XMLSchema#decimal
1.7
NUMBER
instance of
constellation
instance of