J/ApJS/165/360 SiO maser emission toward 10 late-type stars (Kang+, 2006) ================================================================================ Time monitoring observations of SiO j=2-1 and j=3-2 maser emission toward late-type stars. Kang J., Cho S.-H., Kim H.-G., Chung H.-S., Kim H.-R., Roh D.-G., Lee C.-W., Kim S.-J. =2006ApJS..165..360K ================================================================================ ADC_Keywords: Stars, late-type ; Spectroscopy ; Millimetric/submm sources Keywords: circumstellar matter - masers - stars: late-type - stars: oscillations Abstract: We present the results of simultaneous time monitoring observations of SiO J=2-1 and J=3-2 maser emission for 10 late-type stars (8 Mira variables, 1 OH/IR star, and 1 supergiant) with the 14m radio telescope at Taeduk Radio Astronomy Observatory from 1999 January to 2001 February. The SiO v=1, J=2-1 and J=3-2 maser emission was detected at almost all observational epochs. The SiO v=2, J=2-1 maser was detected from 4 late-type stars (VY CMa, R Cas, Cyg, R Leo) and the v=2, J=3-2 maser was detected from 7 stars (R Aqr, TX Cam, R Cas, Cyg, W Hya, R Leo, IK Tau). The v=3, J=2-1 and masers were also detected from Cyg and TX Cam, respectively. Based on these observational data, line profile and peak velocity variations with respect to stellar velocity, antenna temperatures, and their ratio variations as a function of optical phase of central star were investigated. Description: File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 68 10 Observed Sources table3.dat 69 135 Results of SiO J=2-1 Observations: Detected table4.dat 69 154 Results of SiO J=3-2 Observations: Detected -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 A9 --- Name Source name 11- 15 A5 --- Type Type of the star (1) 17- 18 I2 h RAh Right ascension (B1950) 20- 21 I2 min RAm Right ascension (B1950) 23- 26 F4.1 s RAs Right ascension (B1950) 28 A1 --- DE- Declination sign (B1950) 29- 30 I2 deg DEd Declination (B1950) 32- 33 I2 arcmin DEm Declination (B1950) 35- 38 F4.1 arcsec DEs Declination (B1950) 40- 43 F4.1 km/s V* Central star velocity 44 A1 --- r_V* Reference for Vel (2) 46- 51 A6 --- SpType MK spectral type (3) 54- 57 I4 pc Dist Heliocentric Distance 59- 61 I3 pc e_Dist ? rms uncertainty on Dist 62 A1 --- r_Dist Reference for Dist, if not from HIP (I/239) (2) 64- 68 F5.1 d Per ? Period (3) -------------------------------------------------------------------------------- Note (1): Type as follows: M = Miras SR = semiregular variables SG = supergiants OH/IR = stars Note (2): References as follows: a = Cho & Ukita (1995PASJ...47L...1C) b = Loup et al. (1993, Cat. J/A+AS/99/291) c = Cho et al. (1996AJ....111.1987C)) d = Engels (1979A&AS...36..337E, Cat. V/18) e = Marvel (1997PASP..109.1286M) f = Knapp et al. (1982ApJ...252..616K) g = Olofsson et al. (1982A&A...107..128O) h = Dickinson et al. (1978AJ.....83...36D) i = Marengo et al. (1999A&A...348..501M) j = Yates et al. (1995MNRAS.273..529Y) Note (3): From Kholopov et al., 1985, see Cat. II/250. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table[34].dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 A9 --- Name Source name 11- 23 A13 --- Trans Observed transition (1) 25- 29 F5.2 K Tpeak Peak antenna temperature, at transition (1) 31- 34 F4.2 K rms Root-mean-square 36- 41 F6.2 K.km/s Tint Integrated antenna temperature 43- 47 F5.1 km/s Vpeak Peak emission radial LSR velocity 49- 53 F5.1 km/s V-V* Peak LSR velocity minus the central star velocity 55- 64 A10 "Y/M/D" Obs.Date Date of the observation 66- 69 F4.2 --- Phase ? Optical light curve phase -------------------------------------------------------------------------------- Note (1): SiO Transitions and Rest Frequencies Used for Observations: --------------------------------- Transition Frequency (GHz) --------------------------------- v=1, J=2-1 86.243442 v=2, J=2-1 85.640456 v=3, J=2-1 85.038010 v=1, J=3-2 129.36337 v=2, J=3-2 128.45889 v=3, J=3-2 127.55524 --------------------------------- Rest frequencies from Lovas & Frank (1992, J. Phys. Chem. Ref. Data, 21, 181) -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Patricia Vannier [CDS] 14-Dec-2007