PP Carinae

This article is about p Carinae. For P Carinae, see V399 Carinae.
PP Carinae
Location of PP Carinae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 32m 01.46297s[1]
Declination –61° 41′ 07.1963″[1]
Apparent magnitude (V) 3.22 - 3.55[2]
Characteristics
Spectral type B4 Vne[3]
U−B color index –0.71[4]
B−V color index –0.11[4]
Variable type γ Cas[2]
Astrometry
Radial velocity (Rv)+26.0[5] km/s
Proper motion (μ) RA: –17.01[1] mas/yr
Dec.: +11.50[1] mas/yr
Parallax (π)6.75 ± 0.40 mas[1]
Distance480 ± 30 ly
(148 ± 9 pc)
Absolute magnitude (MV)−2.684[6]
Details
Mass7.6 ± 0.1[7] M☉
Radius6.0[8] R☉
Luminosity5,212[6] L☉
Surface gravity (log g)3.52[8] cgs
Temperature19,291[6] K
Rotational velocity (v sin i)325[9] km/s
Age39.8 ± 7.6[7] Myr
Other designations
p Carinae, PP Carinae, CP−61°1704, FK5 397, HD 91465, HIP 51576, HR 4140, SAO 251006
Database references
SIMBADdata

p Carinae is the Bayer designation of a star in the southern constellation of Carina. It has the variable star designation PP Carinae and, at an apparent visual magnitude of +3.3,[5] is readily visible to the naked eye from the southern hemisphere. From the observed parallax shift of this star as the Earth orbits the Sun, its distance can be estimated as roughly 480 light-years (150 parsecs) with a 6% margin of error.[1] It is considered to be a member of the open cluster IC 2602 although it lies well outside the core visible group of stars.[6]

A light curve for PP Carinae, plotted from TESS data[10]

The star is a B-type main sequence star with a stellar classification of B4 Vne.[3] The 'ne' suffix indicates it is a rapidly rotating Be star that is surrounded by hot circumstellar gas. This material adds emission lines to the spectrum of the star. It has a projected rotational velocity of 325 km s−1,[9] with about 7.6[7] times the mass and 6[8] times the radius of the Sun. This star is classified as a Gamma Cassiopeiae-type variable and its brightness varies from magnitude +3.22 to +3.55.[2]

In most versions of its asterism, the neighbouring bright stars, thus plotted along the imaginary hull forming Carina are Theta Carinae, to the south, and V337 (also known as lower case q) Carinae to the east, of second and third magnitude respectively.

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