2014A&A...561A.151N


Query : 2014A&A...561A.151N

2014A&A...561A.151N - Astronomy and Astrophysics, volume 561A, 151-151 (2014/1-1)

Understanding the dynamical structure of pulsating stars. HARPS spectroscopy of the δ Scuti stars ρ Puppis and DX Ceti.

NARDETTO N., PORETTI E., RAINER M., GUIGLION G., SCARDIA M., SCHMID V.S. and MATHIAS P.

Abstract (from CDS):

High-resolution spectroscopy is a powerful tool to study the dynamical structure of a pulsating star's atmosphere. We aim at comparing the line asymmetry and velocity of the two δ Sct stars ρ Pup and DX Cet with previous spectroscopic data obtained on classical Cepheids and β Cep stars. We obtained, analysed and discuss HARPS high-resolution spectra of ρ Pup and DX Cet. We derived the same physical quantities as used in previous studies, which are the first-moment radial velocities and the bi-Gaussian spectral line asymmetries. The identification of f=7.098/d as a fundamental radial mode and the very accurate Hipparcos parallax promote ρ Pup as the best standard candle to test the period-luminosity relations of δ Sct stars. The action of small-amplitude nonradial modes can be seen as well-defined cycle-to-cycle variations in the radial velocity measurements of ρ Pup. Using the spectral-line asymmetry method, we also found the centre-of-mass velocities of ρ Pup and DX Cet, Vγ=47.49±0.07 km/s and Vγ=25.75±0.06 km/s, respectively. By comparing our results with previous HARPS observations of classical Cepheids and β Cep stars, we confirm the linear relation between the atmospheric velocity gradient and the amplitude of the radial velocity curve, but only for amplitudes larger than 22.5 km/s. For lower values of the velocity amplitude (i.e., <22.5 km/s), our data on ρ Pup seem to indicate that the velocity gradient is null, but this result needs to be confirmed with additional data. We derived the Baade-Wesselink projection factor p=1.36±0.02 for ρ Pup and p=1.39±0.02 for DX Cet. We successfully extended the period-projection factor relation from classical Cepheids to δ Scuti stars.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: atmospheres - line: profiles - stars: individual: rho Puppis - stars: individual: DX Ceti - distances stars:

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * bet Cas dS* 00 09 10.68518 +59 08 59.2120 2.73 2.61 2.27 1.97 1.77 F2III 511 0
2 V* BS Tuc dS* 01 08 03.9681734664 -61 52 17.817500280   7.71 7.45     hF0mA1_lB 93 0
3 V* DX Cet dS* 02 36 02.5784004312 +06 25 56.715184344   7.28 7.00     A5 34 0
4 * gam02 Cae dS* 05 04 26.1570986024 -35 42 18.382481569   6.61 6.31     F2IV/V 76 0
5 * bet Dor cC* 05 33 37.5159729864 -62 29 23.376457680 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 365 0
6 NAME 1 Mon reg 06 41.1 +09 53           ~ 5 0
7 * zet Gem cC* 07 04 06.5312384690 +20 34 13.074474962 5.20 4.58 3.79   3.082 G1Ib 553 0
8 * rho Pup dS* 08 07 32.6488235 -24 18 15.567946 3.43 3.24 2.81 2.46 2.25 F5IIkF2IImF5II 290 0
9 V* RS Pup cC* 08 13 04.2157111224 -34 34 42.696447852 8.89 8.51 7.04   5.453 F8Iab 337 0
10 V* AI Vel dS* 08 14 05.1459825192 -44 34 32.854644660   6.98 6.70     A9IV/V 183 0
11 V* RZ Vel cC* 08 37 01.3028699904 -44 06 52.846248456   8.507 7.260     G1Ib 216 0
12 * l Car cC* 09 45 14.8117044917 -62 30 28.450312664   5.09 3.75     G5Iab/b 309 0
13 V* FG Vir dS* 12 14 15.4565381808 -05 42 59.750820036   6.807 6.558     A8/9V 211 0
14 V* S Cru cC* 12 54 21.9975732000 -58 25 50.215759464 7.94 7.34 6.58   5.730 F7Ib/II 183 0
15 * tau01 Lup bC* 14 26 08.2242382 -45 13 17.131532 3.68 4.393 4.553     B2IV 145 0
16 * alf Lup bC* 14 41 55.7557866 -47 23 17.515486 1.22 2.126 2.286     B1.5III 229 0
17 V* R TrA cC* 15 19 45.7128267840 -66 29 45.743160624 7.29 6.96 6.39   5.844 F7Ib/II 182 0
18 V* X Sgr cC* 17 47 33.6239490288 -27 49 50.835778896 5.84 5.34 4.54 6.03 3.661 F7II 325 0
19 V* Y Sgr cC* 18 21 22.9862401944 -18 51 36.006450458 7.31 6.69 5.75   4.810 F8II 283 0
20 * del Sct dS* 18 42 16.4268984096 -09 03 09.188922060   5.04 4.71     F2II-III 465 0
21 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 855 0
22 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 704 0
23 V* SX Phe SX* 23 46 32.8928138474 -41 34 54.769886474   7.40 7.12     A3V 326 0

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2022.11.29-17:08:54

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