2018A&A...616A..82P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:17:06

2018A&A...616A..82P - Astronomy and Astrophysics, volume 616A, 82-82 (2018/8-1)

A new and homogeneous metallicity scale for Galactic classical Cepheids. I. Physical parameters.

PROXAUF B., DA SILVA R., KOVTYUKH V.V., BONO G., INNO L., LEMASLE B., PRITCHARD J., PRZYBILLA N., STORM J., URBANEJA M.A., VALENTI E., BERGEMANN M., BUONANNO R., D'ORAZI V., FABRIZIO M., FERRARO I., FIORENTINO G., FRANCOIS P., IANNICOLA G., LANEY C.D., KUDRITZKI R.-P., MATSUNAGA N., NONINO M., PRIMAS F., ROMANIELLO M. and THEVENIN F.

Abstract (from CDS):

We gathered more than 1130 high-resolution optical spectra for more than 250 Galactic classical Cepheids. The spectra were collected with the optical spectrographs UVES at VLT, HARPS at 3.6m, FEROS at 2.2m MPG/ESO, and STELLA. To improve the effective temperature estimates, we present more than 150 new line depth ratio (LDR) calibrations that together with similar calibrations already available in the literature allowed us to cover a broad range in wavelength (5348≤λ≤8427Å) and in effective temperature (3500≤Teff≤7700K). This gives us the unique opportunity to cover both the hottest and coolest phases along the Cepheid pulsation cycle and to limit the intrinsic error on individual measurements at the level of ∼100K. As a consequence of the high signal-to-noise ratio of individual spectra, we identified and measured hundreds of neutral and ionized lines of heavy elements, and in turn, have the opportunity to trace the variation of both surface gravity and microturbulent velocity along the pulsation cycle. The accuracy of the physical parameters and the number of FeI (more than one hundred) and FeII (more than ten) lines measured allowed us to estimate mean iron abundances with a precision better than 0.1dex. We focus on 14 calibrating Cepheids for which the current spectra cover either the entire or a significant portion of the pulsation cycle. The current estimates of the variation of the physical parameters along the pulsation cycle and of the iron abundances agree very well with similar estimates available in the literature.Independent homogeneous estimates of both physical parameters and metal abundances based on different approaches that can constrain possible systematics are highly encouraged.

Abstract Copyright: © ESO 2018

Journal keyword(s): Galaxy: disk - stars: abundances - stars: fundamental parameters - stars: variables: Cepheids - stars: oscillations

VizieR on-line data: <Available at CDS (J/A+A/616/A82): stars.dat table3.dat table4.dat table5.dat>

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
2 * bet Dor cC* 05 33 37.5125319201 -62 29 23.323100433 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 345 0
3 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 529 0
4 V* RS Pup cC* 08 13 04.2157137938 -34 34 42.691837063 8.89 8.00 6.70   5.453 F8Iab 315 0
5 V* RZ Vel cC* 08 37 01.3029337589 -44 06 52.844429407   8.507 7.260     G1Ib 195 0
6 V* S Cru cC* 12 54 21.9972794334 -58 25 50.214605143 7.94 7.34 6.58   5.730 F7Ib/II 168 0
7 V* R TrA cC* 15 19 45.7123101563 -66 29 45.741722140 7.29 6.96 6.39   5.844 F7Ib/II 167 0
8 V* V340 Ara cC* 16 45 19.1122888146 -51 20 33.394152547   11.39 10.03     ~ 63 0
9 V* X Sgr cC* 17 47 33.6241002643 -27 49 50.848981593 5.84 5.34 4.54 6.03 3.661 F7II 306 0
10 V* Y Oph cC* 17 52 38.7021149511 -06 08 36.875163136 8.62 7.61 6.21     G3Ia 338 0
11 V* AV Sgr cC* 18 04 48.7864032131 -22 43 56.645836757   13.39     10.595 ~ 56 0
12 V* VY Sgr cC* 18 12 04.5660706883 -20 42 14.465377948   12.70 11.36     F6 62 0
13 V* Y Sgr cC* 18 21 22.9864295 -18 51 36.001763 7.31 6.69 5.75   4.810 F8II 267 0
14 V* XX Sgr cC* 18 24 44.5007279272 -16 47 49.819587940   10.51 9.65 9.38   F7/8II 100 0
15 V* UZ Sct cC* 18 31 22.3666774568 -12 55 43.338736715   13.23 10.91   9.195 G0 75 0
16 V* EV Sct cC* 18 36 39.6017832876 -08 11 05.360422056   10.99 9.90     G0II 226 0
17 * eta Aql cC* 19 52 28.3677478 +01 00 20.369619 5.12 4.61 3.80   3.030 F6Iab+B9.8V 632 0
18 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:17:06

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