2001A&A...376..928L


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET19:37:55

2001A&A...376..928L - Astronomy and Astrophysics, volume 376, 928-940 (2001/9-4)

Variability of the H2O maser associated with the Mira variable RS Virginis.

LEKHT E.E., MENDOZA-TORRES J.E., RUDNITSKIJ G.M. and TOLMACHEV A.M.

Abstract (from CDS):

The results of observations of the H2O maser emission (λ=1.35cm) of the Mira-type variable star RS Vir are presented. The observations were carried out in 1981-2001 (JD=2444900-2451995) on the RT-22 radio telescope of the Pushchino Radio Astronomy Observatory (Russia). The variability curve of the H2O maser emission integrated flux Fint(H2O) of RS Vir correlates with its visual light curve with some phase delay Δφ=(0.05-0.35)P (P is the star's period). The delay variations seem to be periodic at a timescale of 19-20 years (``superperiod'' of the maser variations). If the variability of the H2O maser RS Vir is caused by periodic action of pulsation-driven shock waves, the shock travel time from the photosphere to the inner boundary of the H2O maser shell can be as long as (3-5)P. Another explanation is that maser variations may be connected with changing gas density in the masering region of the circumstellar envelope. In particular, long-term maser variations (the ``superperiod'') may be caused by changing mass loss rate {dot}(M).

Abstract Copyright:

Journal keyword(s): stars: variables: general - circumstellar matter - stars: individual: RS Vir - radio lines: stars - masers - shock waves

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* U Aur Mi* 05 42 09.0670768405 +32 02 23.585726564   12.00 11.65     M6.5-9:e 113 0
2 V* U Ori Mi* 05 55 49.1689920441 +20 10 30.690374867 6.82 6.39 5.40     M6-9.5e 476 0
3 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 884 1
4 V* RT Vir AB* 13 02 37.9836301550 +05 11 08.360733054 10.07 9.07 7.41     M8III 301 0
5 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 611 0
6 V* RS Vir Mi* 14 27 16.3931666073 +04 40 41.085779853   10.27 7.00     M8 201 0
7 V* U Her Mi* 16 25 47.4723609675 +18 53 32.862370166 8.85 8.23 6.70     M6.5-8+e 522 1
8 V* VX Sgr s*r 18 08 04.0431479808 -22 13 26.629744195 11.72 9.41 6.52 3.90 2.11 M8.5Ia 556 0
9 V* R Aql OH* 19 06 22.2510506325 +08 13 48.000441251 8.06 7.69 6.09     M6.5-9e 544 0
10 V* RR Aql Mi* 19 57 36.0628075265 -01 53 11.322802573     7.80     M7.5e 282 2
11 V* R Cas Mi* 23 58 24.8700291935 +51 23 19.691977266 6.71 6.63 4.80     M6.5-9e 685 0

    Equat.    Gal    SGal    Ecl

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2021.02.24-19:37:55

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