SIMBAD references

2001ApJ...550L.159M - Astrophys. J., 550, L159-L162 (2001/April-1)

A cepheid is no more: Hubble's variable 19 in M33.


Abstract (from CDS):

We report on the remarkable evolution in the light curve of a variable star discovered by Hubble in M33 and classified by him as a Cepheid. Early in the 20th century, the variable, designated as V19, exhibited a 54.7 day period, an intensity-weighted mean B magnitude of 19.59±0.23 mag, and a B amplitude of 1.1 mag. Its position in the period-luminosity plane was consistent with the relation derived by Hubble from a total of 35 variables. Modern observations by the DIRECT project show a dramatic change in the properties of V19: its mean B magnitude has risen to 19.08±0.05 mag, and its B amplitude has decreased to less than 0.1 mag. V19 does not appear to be a classical (Population I) Cepheid variable at present, and its nature remains a mystery. It is not clear how frequent such objects are or how often they could be mistaken for classical Cepheids.

Abstract Copyright:

Journal keyword(s): Stars: Variables: Cepheids - Galaxies: Individual: Messier Number: M33 - Stars: Evolution

CDS comments: Hubble's variable 19 = VHK 19

Simbad objects: 12

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