PV Telescopii

PV Telescopii

A light curve for PV Telescopii, adapted from Jeffery et al. (2020)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium
Right ascension 18h 23m 14.66203s[2]
Declination −56° 37′ 44.1401″[2]
Apparent magnitude (V) 9.30[3] (9.24 - 9.40)[4]
Characteristics
Spectral type B5p[5]
U−B color index −0.60[3]
B−V color index −0.10[3]
Variable type PV Tel[4]
Astrometry
Radial velocity (Rv)−169[6] km/s
Proper motion (μ) RA: −1.086[2] mas/yr
Dec.: −7.705[2] mas/yr
Parallax (π)0.1162 ± 0.0449 mas[2]
Distance23,000 ly
(7,100+1,400
−2,000[1] pc)
Absolute magnitude (MV)−4.4[7]
Details
Mass0.94[8] M☉
Radius27.20+4.09
−7.26[1] R☉
Luminosity24,000+8,600
−9,900[1] L☉
Surface gravity (log g)1.60±0.25[1] cgs
Temperature13,750±400[1] K
Metallicity [Fe/H]−0.15[9] dex
Other designations
PV Tel, CD−56°7300, HD 168476, HIP 90099, SAO 245434, 2MASS J18231466-5637441, AAVSO 1814-56[10]
Database references
SIMBADdata

PV Telescopii, also known as HD 168476, is a variable star in the southern constellation of Telescopium. It is too dim to be visible to the naked eye, having an apparent visual magnitude that has been measured varying from 9.24 down to 9.40.[4] The star is the prototype of a class of objects called PV Telescopii variables. It is located at an estimated distance of approximately 23 kilolight-years (7.1 kiloparsecs) from the Sun,[1] but is drifting closer with a radial velocity of −169 km/s.[6]

This is an extreme helium star that shows a highly-processed atmosphere.[11] It is a blue-white hued B-type supergiant star with a peculiar spectrum that has "weak hydrogen lines and enhanced lines of He and C".[12][13] This object may be a late thermal pulse post-AGB star or the result of a merger of two white dwarf stars.[8][14] The star shows radial velocity changes thought to be due to radial pulsations caused by a strange mode instability.[8] It shows variations over a few days, 8–10 days being typically quoted.[8][14] Despite a mass thought to be less than the sun,[8] it is actually around 24,000 more luminous.[1]

  1. ^ a b c d e f g h Cite error: The named reference Jeffery_et_al_2020 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference ducati was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Walker_Hill_1985 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Heber1981 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference jeffery_et_al_2001 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference pastel was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Saio_Jeffery_2002 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Simon2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference pandey2011 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Gourgouliatos_Jeffery_2006 was invoked but never defined (see the help page).