PV Telescopii variable


PV Telescopii variable is a type of variable star that is established in the General Catalogue of Variable Stars with the acronym PVTEL. This class of variables are defined as "helium supergiant Bp stars with weak hydrogen lines and enhanced lines of He and C". That is, the hydrogen spectral lines of these stars are weaker than normal for a star of stellar class B, while the lines of helium and carbon are stronger. The prototype for this category is HD 168476, also known as PV Telescopii, which undergoes small but complex luminosity variations and radial velocity fluctuations. The PV Tel stars are extremely hydrogen-deficient compared to other B-class stars and vary in luminosity on time scales ranging from a few hours to several years. As of 2008, there are twelve confirmed PV Tel variables in the General Catalogue of Variable Stars.
PV Telescopii variables are subdivided into three distinct types on the basis of spectral type: type I represents late B and A stars, type II represents O and early B, and type III represents F and G stars. The type III stars are always carbon-rich and hydrogen-deficient, while the type I and II stars do not necessarily have an excess of carbon. The hotter types pulsate more quickly than the cooler types.

List

The following list contains selected PV Telescopii variable that are of interest to amateur or professional astronomy. Unless otherwise noted, the given magnitudes are in the V-band.
Star
Maximum
magnitude
Minimum
magnitude
TypeSpectral
type
Upsilon Sagittarii4.434.65IF2p
HD 1820406.957.17IIIC...
HM Librae7.427.63IIIC
KS Persei7.607.85IA5Iap
PV Telescopii9.249.40IB5p
BD +1 43819.479.60IF
CD -35 117609.629.83IB4Ibe
HD 1606419.7810.08IIsdOC9.5II-III_He40
DN Leonis9.9110.00IIBp
HD 1244489.9410.03IIB3p
NO Serpentis10.2710.39IB
V1920 Cygni10.3010.41IB2/3
CPD -58 272110.4010.60IB+...
BD -9 439510.4410.63IIB
LS IV -1 210.9511.05IOB+