J/PASP/122/144 Multiband photometry of V725 Sgr (Battinelli+, 2010)
Multiband photometry of V725 Sagittarii.
Battinelli P., Demers S.
<Publ. Astron. Soc. Pac., 122, 144-148 (2010)>
=2010PASP..122..144B 2010PASP..122..144B
ADC_Keywords: Stars, variable ; Photometry, UBVRI ; Photometry, infrared
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 30-40yrs 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.
Description:
The observations, presented in this article, were secured with the REM
(Rapid Eye Mount), a robotic 60cm telescope located on La Silla. Our
goal was to obtain observations every 10-15days, weather
permitting, during the long observing season of V725 Sgr. The ROSS
instrument provides optical images in the Kron-Cousins bands.
Objects:
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RA (2000) DE Designation(s)
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18 11 59.4 -36 06 40 V725 Sgr = V* V725 Sgr
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 50 32 Photometry of V725 Sgr
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Date Observation date
12- 18 F7.2 d MJD Modified Julian date
20- 24 F5.2 mag Vmag ? Johnson V magnitude
26- 30 F5.2 mag Icmag ? Cousins I magnitude
32- 35 F4.2 mag Rc-Ic ? Cousins R-I colour index
37- 40 F4.2 mag Kmag ? Johnson K magnitude
42- 45 F4.2 mag J-K ? Johnson J-K colour index
47- 50 F4.2 mag H-K ? Johnson H-K colour index
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-Apr-2010