2004A&A...424..145P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.13CEST00:18:32

2004A&A...424..145P - Astronomy and Astrophysics, volume 424, 145-156 (2004/9-2)

28SiO v=1 and v=2, J=1-0 maser variability in evolved stars. Eleven years of short spaced monitoring.

PARDO J.R., ALCOLEA J., BUJARRABAL V., COLOMER F., DEL ROMERO A. and DE VICENTE P.

Abstract (from CDS):

This paper presents and discusses the final data set of a long-term and short-spaced monitoring of 21 SiO maser sources, mostly evolved stars, carried out in two SiO maser lines at 43GHz with the Observatorio Astronomico Nacional 13.7m telescope at the Centro Astronomico de Yebes (Guadalajara, Spain). In most objects, more than 80 spectra per transition over a period of 11 years have been recorded. The new data presented here, previously unpublished, represent nearly 50% of the total SiO data collected in the project. In addition, the availability of optical light curves from the AAVSO for most of the objects during the whole period of the SiO monitoring, ground-based near-IR data for four sources overlapping with 3 to 5 observed SiO periods, and DIRBE near-IR data covering a significant portion of an SiO period in 10 sources, make this data set a unique reference for comparing optical, NIR and SiO variability in order to elucidate the physical mechanisms that pump SiO masers in evolved stars. The basis for the conclusions obtained in this work comes from a numerical time series analysis of the suitable SiO, optical and NIR light curves in regular variables to obtain precise values of the periods and phase lags between the different curves. This analysis shows evidence that in regular variable evolved stars the three types of emission have the same period and that the SiO maxima happen in phase with NIR maxima and with a phase lag typically between 0.05 and 0.20 with respect to optical maxima. We conclude that in these objects the observational evidence presented in this work favors the radiative pumping of SiO masers against the collisional pumping.

Abstract Copyright:

Journal keyword(s): stars: late type - masers - stars: AGB and post-AGB - radio lines: stars

Simbad objects: 21

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Number of rows : 21

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 IRC +10011 OH* 01 06 25.9889735162 +12 35 52.890666456   20.7   18.26 14.01 M8 406 0
2 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1461 0
3 V* IK Tau Mi* 03 53 28.8884898148 +11 24 21.865959095 16.99 17.03 13.39 7.29 3.20 M7-11 589 0
4 V* TX Cam Mi* 05 00 51.1569959503 +56 10 54.093107078       14.02   M9-9.5 334 0
5 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 591 1
6 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 1027 0
7 V* R Cnc Mi* 08 16 33.8242753267 +11 43 34.518296107 10.66 10.17 8.64 4.91 1.95 M6.5-9e 278 2
8 V* X Hya Mi* 09 35 30.2649838030 -14 41 28.638849297   10.02 7.20     M7-8+e 141 0
9 V* R LMi Mi* 09 45 34.2832012840 +34 30 42.836146420   10.96 9.99     M6.5-9e 313 0
10 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 886 1
11 V* RT Vir AB* 13 02 37.9836301550 +05 11 08.360733054 10.07 9.07 7.41     M8III 302 0
12 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 612 0
13 V* U Her Mi* 16 25 47.4723609675 +18 53 32.862370166 8.85 8.23 6.70     M6.5-8+e 522 1
14 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 561 0
15 OH 26.5 +0.6 OH* 18 37 32.50920 -05 23 59.1936           O-rich 286 0
16 V* R Aql OH* 19 06 22.2510506325 +08 13 48.000441251 8.06 7.69 6.09     M6.5-9e 544 0
17 V* GY Aql Mi* 19 50 06.3363350098 -07 36 52.425980016   12.54 11.22     M8 104 0
18 * chi Cyg S* 19 50 33.9243904 +32 54 50.609683 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 670 0
19 * mu. Cep s*r 21 43 30.4610574 +58 46 48.160181 8.85 6.43 4.08 1.98 0.22 M2-Ia 633 1
20 V* R Aqr Sy* 23 43 49.4629939776 -15 17 04.184232557   8.823 7.683 9.37   M6.5-8.5e 750 0
21 V* R Cas Mi* 23 58 24.8700291935 +51 23 19.691977266 6.71 6.63 4.80     M6.5-9e 686 0

    Equat.    Gal    SGal    Ecl

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2021.04.13-00:18:32

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