OU Puppis

This article is about L₁ Puppis. For other stars with this Bayer designation, see L Puppis.

OU Puppis (OU Pup) is a chemically peculiar class A0 (white main-sequence) star in the constellation Puppis. Its apparent magnitude is about 4.9 and it is approximately 188 light-years away based on parallax.

A light curve for OU Puppis, plotted from TESS data^[8]

OU Puppis

Location of OU Puppis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Puppis
Right ascension	07h 13m 13.35060s[1]
Declination	−45° 10′ 57.8554″[1]
Apparent magnitude (V)	4.87[2]
Characteristics
Spectral type	A0pSi[3]
U−B color index	−0.07[4]
B−V color index	−0.03[4]
Variable type	α2 CVn[5]
Astrometry
Radial velocity (Rv)	+4.30[6] km/s
Proper motion (μ)	RA: −25.166[1] mas/yr Dec.: −87.380[1] mas/yr
Parallax (π)	17.3622±0.0768 mas[1]
Distance	187.9 ± 0.8 ly (57.6 ± 0.3 pc)
Absolute magnitude (MV)	1.11[2]
Details[1]
Mass	2.215 M☉
Radius	2.232 R☉
Luminosity	37.05 L☉
Surface gravity (log g)	4.26[7] cgs
Temperature	9,568 K
Metallicity [Fe/H]	−0.67 dex
Rotational velocity (v sin i)	34[7] km/s
Age	382 Myr
Other designations
L1 Puppis, OU Pup, CD−44°3223, GC 9591, GSC 08119–01757, HIP 34899, HR 2746, HD 56022, SAO 218546
Database references
SIMBAD	data

It is an α² CVn variable, ranging from 4.93 to 4.86 magnitudes with a period of 0.92 of a day.^[5] Its spectrum has unusually strong lines of silicon, chromium, and strontium, making it an Ap star.^[9]

Unlike the majority of star pairs, the number attached to the Bayer designation 'L' is generally a subscript: L₁. Its better-known companion L₂ Puppis is similarly represented.^[10]