Multiband Photometry of V725 Sagittarii
Abstract
V725 Sgr is a rather peculiar variable that showed a period increase during part of the twentieth century. Its behavior is attributed to rapid stellar evolution. V725 Sgr was monitored in V, R, I and J, H, K with the REM telescope, on La Silla, from 2008 August to 2009 November. Its light variation does not show a well-defined cyclic behavior. Its current <V> is similar to what it was 30-40 yrs ago. Its published motion suggests that V725 Sgr is located at a few kiloparsecs from the Sun. This implies that V725 Sgr is a giant rather than a supergiant star. From its mean colors we conclude that V725 Sgr is now an irregular variable of spectral type ∼K4 III.
Based on observations obtained with the REM Telescope, INAF Chile.
- Publication:
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Publications of the Astronomical Society of the Pacific
- Pub Date:
- February 2010
- DOI:
- Bibcode:
- 2010PASP..122..144B