2010A&A...517A..57J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.11CEST11:39:28

2010A&A...517A..57J - Astronomy and Astrophysics, volume 517, A57-57 (2010/7-1)

Stellar atmosphere parameters with MAχ, a MAssive compression of χ2 for spectral fitting.

JOFRE P., PANTER B., HANSEN C.J. and WEISS A.

Abstract (from CDS):

MAχ is a new tool to estimate parameters from stellar spectra. It is based on the maximum likelihood method, with the likelihood compressed in a way that the information stored in the spectral fluxes is conserved. The compressed data are given by the size of the number of parameters, rather than by the number of flux points. The optimum speed-up reached by the compression is the ratio of the data set to the number of parameters. The method has been tested on a sample of low-resolution spectra from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) survey for the estimate of metallicity, effective temperature and surface gravity, with accuracies of 0.24dex, 130K and 0.5dex, respectively. Our stellar parameters and those recovered by the SEGUE Stellar Parameter Pipeline agree reasonably well. A small sample of high-resolution VLT-UVES spectra is also used to test the method and the results were compared to a more classical approach. The speed and multi-resolution capability of MAχ combined with its performance compared with other methods indicates that it will be a useful tool for the analysis of upcoming spectral surveys.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - surveys - stars: fundamental parameters - methods: data analysis - methods: statistical

Simbad objects: 28

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Number of rows : 28

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 HD 3567 PM* 00 38 31.9476246205 -08 18 33.395481958 9.54 9.70 9.23     F7/8wF3 190 0
2 HD 19445 PM* 03 08 25.5884 +26 19 51.400 8.29 8.52 8.06 7.60 7.27 G2VFe-3 739 0
3 BD+20 571 PM* 03 27 39.4524583375 +21 02 34.997258945   11.36   10.8   G0 51 0
4 HD 22879 Pe* 03 40 22.0654223510 -03 13 01.124769689 7.146 7.222 6.667 6.346 6.016 G0VmF2 434 0
5 HD 25704 ** 04 01 44.6318109883 -57 12 24.595289561   8.65 8.10     F7V 133 0
6 CD-33 3337 PM* 06 54 47.8102286237 -33 44 49.020854453   9.56 9.03     F5 84 0
7 CD-57 1633 HV* 07 06 28.9517777029 -57 27 29.118056344   10.04 9.54     F7V 86 0
8 CD-45 3283 PM* 07 34 18.5967102074 -45 16 42.875165214   11.08 10.43     G8V-VI 65 0
9 * 171 Pup PM* 07 45 34.9191268687 -34 10 21.283643355   5.909 5.362     F9V 279 0
10 HD 63598 PM* 07 48 53.5379266143 -24 58 24.217788534   8.47 7.93     G2V 55 0
11 HD 298986 PM* 10 17 14.8775103392 -52 29 18.691601582   10.46 10.03   9.48 F5 72 0
12 HD 97320 Pe* 11 11 00.7344947834 -65 25 37.746274848   9.769 9.269     F3V 122 0
13 HD 103723 PM* 11 56 36.0250188318 -21 25 09.826660968   10.554 10.091     F5/6V 67 0
14 HD 105004 PM* 12 05 24.8526214531 -26 35 43.746369085   10.96 10.39     F9 91 0
15 BD-04 3208 PM* 12 07 15.0719832426 -05 44 01.609304815   10.40 9.99     A7 133 0
16 HD 106038 PM* 12 12 01.3690548564 +13 15 40.620671155 10.45 10.630 10.162 9.851 9.539 F6wl 169 0
17 HD 113679 PM* 13 05 52.8243888123 -38 30 59.990798799   10.342 9.797     G2/3V 81 0
18 HD 116064 Pe* 13 21 43.7823913103 -39 18 39.998476883   9.26 8.81     F9IV-Vm-5 123 0
19 HD 121004 PM* 13 53 58.1163515488 -46 32 19.526169178   10.112 9.522     G2V 126 0
20 HD 122196 PM* 14 01 02.1244272306 -38 03 03.297565043   9.19 8.75     F0(V)w 107 0
21 HD 126681 PM* 14 27 24.9096361739 -18 24 40.457119166   9.939 9.535     G3V 164 0
22 HD 160617 PM* 17 42 49.3235999900 -40 19 15.505712142   9.18 8.73 8.394 8.065 G0 182 0
23 HD 175179 PM* 18 54 23.2030233107 -04 36 18.624524830 9.56 9.61 9.03     G5V 103 0
24 HD 188510 PM* 19 55 09.6783577203 +10 44 27.395091177 9.30 9.41   8.5   G5V: 232 0
25 HD 189558 PM* 20 01 00.2452564415 -12 15 20.355884232   8.27 7.72     F8/G2V 170 1
26 HD 195633 PM* 20 32 23.9917031781 +06 31 03.251333868 9.05 9.03 8.52     G0Vw 126 0
27 CD-30 18140 PM* 20 44 06.2871219229 -30 00 07.598765502   10.326 9.932     F8 73 0
28 HD 205650 PM* 21 37 26.0309417494 -27 38 06.697112156   9.59 9.00     F6V 94 0

    Equat.    Gal    SGal    Ecl

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2020.07.11-11:39:28

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