1999A&A...351..644L


Query : 1999A&A...351..644L

1999A&A...351..644L - Astronomy and Astrophysics, volume 351, 644-656 (1999/11-2)

Velocity variations of semiregular variables in the infrared.

LEBZELTER T.

Abstract (from CDS):

We obtained time series of high resolution spectra around 1.6µm for 15 short period semiregular variables to study the velocity variations in their atmospheres with the help of second overtone vibration-rotational lines of CO. All objects of our sample clearly show velocity variations of a few km/s. The amplitude of the `blue' SRVs (according to Kerschbaum & Hron, 1992A&A...263...97K) is on the average a factor of two smaller than that of the `red' SRVs. Periodicity of the variations differs from star to star. Some SRVs vary with the period listed in the General Catalogue of Variable Stars (GCVS4), others with a considerable longer period. But for all SRVs the measured velocities at 1.6µm are over a large part of the cycle smaller than the velocities found in the literature. Different explanations of this feature are discussed. We think that the observed difference in mean velocity might be caused by a blueshift due to large convective cells on the stellar surface.

Abstract Copyright:

Journal keyword(s): stars: variables: general - stars: AGB and post-AGB - stars: atmospheres

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * omi Ori S* 04 52 31.9624004856 +14 15 02.311506180   6.458 4.721     M3SIII 211 0
2 * 1 Lyn LP? 06 17 54.8190724 +61 30 55.025075   6.89 5.05     M3III 46 0
3 * mu. Gem LP* 06 22 57.62686 +22 30 48.8979 6.37 4.51 2.87 1.30 -0.08 M3IIIab 371 1
4 * 51 Gem LP* 07 13 22.2758350560 +16 09 32.271188148 8.48 6.66 5.00     M4III 93 0
5 V* BC CMi LP* 07 52 07.1897763792 +03 16 38.436929508   7.85 6.39     M4/5III 45 0
6 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 891 1
7 V* TU CVn LP* 12 54 56.5204176096 +47 11 48.200441856 8.96 7.39 5.84     M5-III-IIIa 91 0
8 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 622 0
9 V* ER Vir LP* 14 06 41.6449834896 -14 12 17.597713140   8.16 6.61     M4III 40 0
10 * 13 Boo LP* 14 08 17.3027518032 +49 27 29.396447352 8.82 6.90 5.25     M1.5III 83 0
11 V* RV Boo AB* 14 39 15.8615969712 +32 32 22.250745204   9.50 7.90     M5-6IIIe 91 0
12 V* RR UMi LP* 14 57 35.0072853 +65 55 56.856956 7.86 6.19 4.54 2.69 0.97 M4.5III 173 0
13 V* RR CrB LP* 15 41 26.2283819568 +38 33 26.600250528   9.02 8.40     M3 49 0
14 V* ST Her S* 15 50 46.6232210160 +48 28 58.850853780   9.09 7.75     M6S-M7SIII: 158 0
15 V* X Her AB* 16 02 39.1730141112 +47 14 25.265335956   7.64 6.58     M6III 230 0
16 V* RY CrB LP* 16 23 05.1060105576 +30 51 00.603973152   10.81 9.57     M8+III 42 0
17 * g Her AB* 16 28 38.5485851 +41 52 54.040593 7.70 6.53 5.01 2.49 0.26 M6-III 370 0
18 V* TX Dra LP* 16 35 00.7152884232 +60 28 05.227778640   8.86 7.36     M5 68 0
19 V* TT Dra LP* 17 12 52.2991567968 +57 51 45.468129168   10.56 9.33     M5 27 0
20 V* OP Her S* 17 56 48.5269765296 +45 21 03.060662328 9.45 7.93 6.32 4.15 2.25 M6S 148 0
21 V* W Cyg LP* 21 36 02.4961902 +45 22 28.529170 8.21 6.97 5.38 3.03 0.89 M4e-M6eIII 177 0
22 V* RU Cyg Mi* 21 40 39.0914354280 +54 19 28.954365060   9.14 7.29     M7II-III 106 0

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2022.05.24-07:21:30

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