1996A&A...306..417B


Query : 1996A&A...306..417B

1996A&A...306..417B - Astronomy and Astrophysics, volume 306, 417-426 (1996/2-2)

Fundamental parameters of Cepheids. III. Turbulence variations.

BERSIER D. and BURKI G.

Abstract (from CDS):

Observations of the line broadening during the cycle of pulsation are analysed for 41 Cepheids. The main components of this line broadening are the stellar atmospheric turbulence and the velocity fields due to pulsation and to axial rotation. The variation of the broadening due to pulsation is calculated for each star by using the observed radial velocity curve. The residual broadening at maximum radius allows to show that the value of the equatorial rotational velocity is smaller than ∼10 km/s for the large majority of classical Cepheids. It will be shown that turbulence is the major effect that can explain the variation of the lines widths during the cycle of pulsation. We show that the behaviours of classical and s-Cepheids are different with respect to turbulence and a new method is proposed to separate these classes. This leads to the discovery of a few new s-Cepheids. The second overtone Cepheid V473 Lyr does not follow the sequence of s-Cepheids, that are highly suspected to be overtone pulsators. It is also shown that the turbulence is in phase with the acceleration and, particularly, that the maximum turbulence is attained near minimum radius, where the acceleration is also at its maximum.

Abstract Copyright:

Journal keyword(s): stars: Cepheids - stars: rotation - pulsation - line: profiles - overtone pulsation - turbulence - techniques: radial velocities

Simbad objects: 39

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Number of rows : 39
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* FM Cas cC* 00 14 28.2413359663 +56 15 10.573326187   10.15 9.16   7.984 F7.5Ib 109 0
2 V* SY Cas cC* 00 15 09.8128640040 +58 25 27.439915823   10.69 9.92   8.789 F5 118 0
3 V* DL Cas cC* 00 29 58.5886100054 +60 12 43.069687745 10.66 9.88 8.63   7.582 G1Ib-IIHdel-1 309 0
4 V* V636 Cas cC* 01 32 43.2247655304 +63 35 37.698927235   8.486 7.176     G0Ib 101 0
5 V* V440 Per cC* 02 23 51.7443033534 +55 21 53.502365644 7.76 7.120 6.291     F8Ib-II 173 0
6 V* SU Cas cC* 02 51 58.7508894403 +68 53 18.601570075 6.92 6.44 5.80     F5.5III+ 412 1
7 V* SW Tau WV* 04 24 32.9729177626 +04 07 24.079650708   10.23 9.33     A7 109 0
8 V* SZ Tau cC* 04 37 14.7778803229 +18 32 34.929341041 7.65 7.13 6.37     F6.7:Ib 293 0
9 V* ST Tau cC* 05 45 03.1601683809 +13 34 34.903166002   9.13 7.79   7.149 G0 121 0
10 V* EU Tau cC* 05 45 40.5287885881 +18 39 24.820727851   8.71 8.08     G5 108 0
11 V* T Mon cC* 06 25 12.9997562821 +07 05 08.561189768 8.24 7.20 5.98   4.996 G3Iabv+A0p 452 1
12 V* DX Gem cC* 06 33 54.6101670962 +14 28 17.011049441   11.24 10.73     ~ 91 0
13 V* BB Gem cC* 06 34 35.2938235569 +13 04 44.707699381   11.85 11.16     ~ 64 0
14 V* BE Mon cC* 06 40 05.5823302469 +07 36 20.987932485   11.6 10.5     G5 78 0
15 V* V508 Mon cC* 06 47 09.3999270974 +03 58 01.550964840   11.50 10.53     ~ 67 0
16 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 544 0
17 V* V465 Mon cC* 07 08 09.3121532568 -00 03 56.575387117   11.07       G0 73 0
18 V* CS Vel cC* 09 41 10.2609558071 -53 48 57.782655270   12.46 11.24   10.078 ~ 98 0
19 V* TW Nor cC* 16 04 55.2266686530 -51 57 12.652767620   13.67 11.17     ~ 149 0
20 V* V340 Nor cC* 16 13 17.3998357878 -54 14 05.588347830   9.61 8.47 8.83   G2Iab 142 0
21 V* S Nor cC* 16 18 51.8313333962 -57 53 59.253617873 8.15 7.49 6.49   5.427 F8/G0Ib 352 1
22 * gam01 Sgr cC* 18 05 01.2265190154 -29 34 48.303215344 5.99 5.47 4.69   3.869 G0Ib/II 333 0
23 V* U Sgr cC* 18 31 53.3321808602 -19 07 30.262730218 8.50 7.81 6.68   5.413 G1Ib 442 0
24 V* EV Sct cC* 18 36 39.6017832876 -08 11 05.360422056   10.99 9.90     G0II 236 0
25 V* V473 Lyr cC* 19 15 59.4894683081 +27 55 34.683764506 7.18 6.770 6.153     F8Ib-II 208 0
26 V* U Vul cC* 19 36 37.7280897633 +20 19 58.569232928   8.368 7.162   5.556 F8Iab 217 0
27 V* SV Vul cC* 19 51 30.9059608126 +27 27 36.835645654 8.65 9.00 6.74   5.703 F8Ia 408 0
28 * eta Aql cC* 19 52 28.3677478 +01 00 20.369619 5.12 4.61 3.80   3.030 F6Iab+B9.8V 645 0
29 V* X Vul cC* 19 57 28.6055727685 +26 33 23.281913956   10.16 8.87   7.147 F8Ia 158 0
30 V* X Cyg cC* 20 43 24.1918662954 +35 35 16.075732392 8.69 7.70 6.47   5.241 F7Ib 446 0
31 V* T Vul cC* 20 51 28.2382502598 +28 15 01.816605372 6.89 6.49 5.77   5.061 F5Ib+A0.8V 326 0
32 V* DT Cyg cC* 21 06 30.2442673195 +31 11 04.765587914 6.70 6.38 5.82     F7II- 297 0
33 V* VZ Cyg cC* 21 51 41.4415144699 +43 08 02.538005456   10.02 8.60   7.948 G0 159 0
34 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 693 0
35 V* RR Lac cC* 22 41 26.5258632443 +56 25 58.029719396   9.68 8.87   7.786 K0 164 0
36 V* CR Cep cC* 22 46 24.7705225443 +59 26 31.922218882   10.94 9.64   7.931 G0 88 0
37 V* X Lac cC* 22 49 03.1806947647 +56 25 41.530855473   9.21 8.42     G5 160 0
38 V* DD Cas cC* 23 57 34.9599200756 +62 43 05.683891313   10.95 9.84   8.516 F7 117 0
39 V* CF Cas cC* 23 58 17.9757306390 +61 13 15.821709555   12.72 10.80   9.700 F8Ibv 226 0

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2021.09.16-17:08:40

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