PU Puppis

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PU Puppis
Puppis constellation map.svg
Red circle.svg
Location of PU Puppis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Puppis
Right ascension 07h 38m 18.04541s [1]
Declination −25° 21 53.3017 [1]
Apparent magnitude  (V)4.69 [2]
Characteristics
Spectral type B8III [3]
U−B color index −0.35 [4]
B−V color index −0.11 [4]
Variable type β Lyr [5]
Astrometry
Radial velocity (Rv)+41.00 [6]  km/s
Proper motion (μ)RA: −3.03 [1]   mas/yr
Dec.: −7.42 [1]   mas/yr
Parallax (π)5.27 ± 0.26  mas [1]
Distance 620 ± 30  ly
(190 ± 9  pc)
Absolute magnitude  (MV)−1.80 ± 0.25
(−1.77 + 5.85) [7]
Absolute bolometric
magnitude
 (Mbol)
−2.35 + 5.54 [7]
Orbit [7]
Period (P)2.58237 ± 0.00005 d
Semi-major axis (a)13.30 ± 0.40  R
Inclination (i)56.2°
Details [7]
PU Pup A
Mass 4.10 ± 0.20  M
Radius 6.60 ± 0.30  R
Luminosity 695 ± 80  L
Surface gravity (log g)3.40 ± 0.05  cgs
Temperature 11500 ± 500  K
Rotational velocity (v sin i)123 [8]  km/s
PU Pup B
Mass 0.65 ± 0.05  M
Radius 0.90 ± 0.10  R
Luminosity0.50 ± 0.10  L
Surface gravity (log g)4.30 ± 0.10  cgs
Temperature 5000 ± 350  K
Other designations
m Puppis, PU Pup, CD-25°4828, CCDM  J07383-2522AB, GC  10266, HIP  37173, HR  2944, HD  61429, SAO  174175, WDS  J07383-2522AB
Database references
SIMBAD data

PU Puppis (PU Pup) is a class B8III [3] (blue giant) star in the constellation Puppis. Its apparent magnitude is 4.69 [2] and it is approximately 620 light years away based on parallax. [1]

A light curve for PU Puppis, plotted from TESS data PUPupLightCurve.png
A light curve for PU Puppis, plotted from TESS data

It is a β Lyrae variable, ranging from 4.75 to 4.69 magnitude with a period of 2.58 days. [5] The secondary is estimated at 5.6 magnitude, although recent observations have failed to confirm it. [10] [11] The primary has a mass of 4.10 solar masses, and is radiating at an effective temperature of 11,500 K. The secondary, with a mass 65% that of the Sun, has a surface temperature of about 5,000 K. [7]

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References

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