2015A&A...577A.132M


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST22:20:40

2015A&A...577A.132M - Astronomy and Astrophysics, volume 577A, 132-132 (2015/5-1)

Stellar parameters of early-M dwarfs from ratios of spectral features at optical wavelengths.

MALDONADO J., AFFER L., MICELA G., SCANDARIATO G., DAMASSO M., STELZER B., BARBIERI M., BEDIN L.R., BIAZZO K., BIGNAMINI A., BORSA F., CLAUDI R.U., COVINO E., DESIDERA S., ESPOSITO M., GRATTON R., GONZALEZ HERNANDEZ J.I., LANZA A.F., MAGGIO A., MOLINARI E., PAGANO I., PERGER M., PILLITTERI I., PIOTTO G., PORETTI E., PRISINZANO L., REBOLO R., RIBAS I., SHKOLNIK E., SOUTHWORTH J., SOZZETTI A. and SUAREZ-MASCARENO A.

Abstract (from CDS):

Low-mass stars have been recognised as promising targets in the search for rocky, small planets with the potential of supporting life. As a consequence, Doppler search programmes using high-resolution spectrographs like HARPS or HARPS-N are providing huge quantities of optical spectra of M dwarfs. However, determining the stellar parameters of M dwarfs using optical spectra has proven to be challenging. We aim to calibrate empirical relationships to determine accurate stellar parameters for early-M dwarfs (spectral types M0-M4.5) using the same spectra as those that are used for radial velocity determinations, without the necessity of acquiring IR spectra or relying on atmospheric models and/or photometric calibrations. Our methodology consists of using ratios of pseudo-equivalent widths of spectral features as a temperature diagnostic, a technique frequently used in solar-type stars. Stars with effective temperatures obtained from interferometric estimates of their radii are used as calibrators. Empirical calibrations for the spectral type are also provided. Combinations of features and ratios of features are used to derive calibrations for the stellar metallicity. Our methods are then applied to a large sample of M dwarfs that are currently being observed in the framework of the HARPS GTO search for extrasolar planets. The derived temperatures and metallicities are used together with photometric estimates of mass, radius, and surface gravity to calibrate empirical relationships for these parameters. A long list of spectral features in the optical spectra of early-M dwarfs was identified. This list shows that the pseudo-equivalent width of roughly 43% of the features is strongly anticorrelated with the effective temperature. The correlation with the stellar metallicity is weaker. A total of 112 temperature sensitive ratios were identified and calibrated over the range 3100-3950K, providing effective temperatures with typical uncertainties of about 70K. Eighty-two ratios of pseudo-equivalent widths of features were calibrated to derive spectral types within 0.5 subtypes for stars with spectral types between K7V and M4.5V. We calibrated 696 combinations of the pseudo-equivalent widths of individual features and temperature-sensitive ratios for the stellar metallicity over a metallicity range from -0.54 to +0.24dex, with estimated uncertainties in the range of 0.07-0.10 dex. We provide our own empirical calibrations for stellar mass, radius, and surface gravity. These parameters depend on the stellar metallicity. For a given effective temperature, lower metallicities predict lower masses and radii as well as higher gravities.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - stars: late-type - stars: low-mass - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/577/A132): table2.dat table4.dat table6.dat readme.txt mdslines.tar>

Simbad objects: 66

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Number of rows : 66

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 225213 Fl* 00 05 24.4278018131 -37 21 26.504223709 11.074 10.022 8.562 7.589 6.432 M2V 176 0
2 V* GX And Fl* 00 18 22.8849667932 +44 01 22.637271919   10.120   7.3   M2V 437 1
3 BD+61 195 PM* 01 02 38.8679928575 +62 20 42.172837073   11.439   8.7   M1.5V 182 0
4 V* YZ Cet Fl* 01 12 30.6367741360 -16 59 56.361313690 15.315 13.885 12.074 10.696 8.938 M4.0Ve 182 0
5 BD+02 348 PM* 02 12 20.9874569826 +03 34 32.230562527 12.552 11.477 10.042 9.092 7.988 M1V 143 0
6 V* BX Cet BY* 02 36 15.2666844128 +06 52 17.924295081   13.28   11.405   M3.5V 146 1
7 HD 285968 PM* 04 42 55.7753203198 +18 57 29.394344631 12.668 11.49 9.951 8.931 7.702 M2.5V 233 2
8 NAME Kapteyn's star BY* 05 11 40.5893175460 -45 01 06.353955874 11.624 10.433 8.853 7.9 6.899 M1VIp 270 0
9 HD 36395 PM* 05 31 27.3958475290 -03 40 38.021551815 10.626 9.443 7.968 6.996 5.913 M1.5Ve 414 0
10 Ross 47 BY* 05 42 09.2672965388 +12 29 21.611736198 14.264 13.130 11.509 10.298 8.709 M4V 210 0
11 HD 42581 Fl* 06 10 34.6152510171 -21 51 52.658021185 10.801 9.607 8.125 7.164 6.121 M1V 382 0
12 L 32-9 PM* 06 33 43.2774443827 -75 37 47.957345432   11.87 10.484 10.170   M2V 32 0
13 HD 50281B PM* 06 52 18.0414038629 -05 11 24.039080436   11.47 10.05 9.870   M2.5V 100 1
14 BD+05 1668 PM* 07 27 24.49975 +05 13 32.8332 12.558 11.443 9.872 8.699 7.161 M3.5V 325 0
15 L 674-15 PM* 08 12 40.8887006440 -21 33 06.982376130   13.7 12.131 11.753 9.24 M3.5V 73 0
16 G 113-20 PM* 08 16 07.9814381592 +01 18 09.267240612 12.824 11.63 10.091 9.071 7.851 M2.0V 87 0
17 HD 79210 Fl* 09 14 22.7754519714 +52 41 11.792840757   9.388   6.8   K7V 242 0
18 HD 304636 PM* 09 21 37.6013907608 -60 16 55.030802577 12.145 10.955 9.465 8.517 7.511 M0.0 53 0
19 L 678-39 PM* 09 36 01.6372518187 -21 39 38.878281901 13.647 12.48 10.906 9.858 8.577 M2.5V 84 0
20 CD-40 5404 ** 09 39 46.3688775322 -41 04 03.201224127 13.395 12.215 10.694 9.617 8.231 M3V 89 0
21 CD-45 5378 PM* 09 44 29.8366584740 -45 46 35.425593490 12.278 11.372 9.979 9.019 7.829 M1.0 62 0
22 V* AN Sex RS* 10 12 17.6684359061 -03 44 44.393843397 11.941 10.757 9.264 8.258 7.066 M2V 184 0
23 BD+20 2465 ** 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1111 0
24 BD+01 2447 PM* 10 28 55.5513010331 +00 50 27.601817738 12.389 11.151 9.650 8.617 7.389 M2.0Ve 245 0
25 BD+44 2051 PM* 11 05 28.57798 +43 31 36.3914 11.440 10.270   7.9   M1.0Ve 258 0
26 CD-23 9765 PM* 11 09 31.3450134735 -24 35 55.118188235 13.173 11.974 10.446 9.425 8.194 M2V 57 0
27 CD-31 9113 PM* 11 35 26.9474098036 -32 32 23.883014588 12.508 11.322 9.813 8.821 7.664 M2V 118 1
28 Ross 905 PM* 11 42 11.0933874353 +26 42 23.658083337   12.06 10.613 10.272 8.24 M3V 471 1
29 CD-51 5974 PM* 11 43 19.8196617612 -51 50 25.928677773   11.89 10.360 10.005   M1 41 0
30 Ross 128 Fl* 11 47 44.3968668170 +00 48 16.404931305 14.223 12.905 11.153 9.859 8.184 M4V 316 0
31 Ross 695 PM* 12 24 52.5025942844 -18 14 32.249916666 13.954 12.863 11.272 10.243 8.991 M2 89 0
32 CD-51 6859 PM* 12 37 52.2156541938 -52 00 05.321462032 13.397 12.198 10.663 9.586 8.233 M3V(e) 89 0
33 BD+11 2576 PM* 13 29 59.7856884759 +10 22 37.784822214 11.728 10.524 9.029 8.07 7.013 M1.0Ve 188 0
34 HD 119850 Fl* 13 45 43.7754528655 +14 53 29.473195472 10.989 9.894 8.50 7.465 6.363 M2V 280 0
35 HD 122303 PM* 14 01 03.1881878880 -02 39 17.514921066 12.343 11.177 9.707 8.745 7.66 M0V 115 0
36 V* V645 Cen Fl* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 885 0
37 BD-11 3759 BY* 14 34 16.8115600986 -12 31 10.417356933 14.041 12.915 11.317 10.093 8.473 M3.5V 148 0
38 BD+16 2708 Fl* 14 54 29.2359453437 +16 06 03.798840236 12.86 11.686 10.150 9.116 7.872 M3V 234 1
39 BD-07 4003 BY* 15 19 26.8271336166 -07 43 20.190958776 13.403 11.76 10.560 9.461 8.911 M3V 519 2
40 CD-40 9712 PM* 15 32 12.9326267337 -41 16 32.131578815 11.918 10.815 9.311 8.265 6.947 M2.5V 107 0
41 CD-37 10765A PM* 16 20 03.5069592465 -37 31 44.408435114 13.314 12.145 10.586 9.495 8.116 M3V 53 0
42 BD-12 4523 BY* 16 30 18.0582010683 -12 39 45.323235188 12.829 11.638 10.072 8.917 7.421 M3V 244 0
43 HD 152751 ** 16 55 28.75758 -08 20 10.7876 11.647 10.593 9.023 7.937 6.565 M3.5Ve 477 1
44 BD+25 3173 PM* 16 58 08.8497933735 +25 44 38.971120252 12.342 11.139 9.655 8.685 7.602 M2V 160 1
45 HD 156384C PM* 17 18 58.8271844065 -34 59 48.612934284 12.96 11.79 10.22 10.05 8.82 M1.5V 157 1
46 CD-46 11540 PM* 17 28 39.9455601300 -46 53 42.693246243 12.177 10.973 9.407 8.337 7.006 M3V 196 1
47 BD+05 3409 PM* 17 30 22.7281969656 +05 32 54.663804222 11.981 10.79 9.433 8.348 7.382 M1.0Ve 109 0
48 CD-48 11837 PM* 17 35 13.6166681026 -48 40 51.124034671 12.875 11.673 10.127 9.101 7.871 M3V 50 0
49 CD-44 11909 PM* 17 37 03.6657231894 -44 19 09.168952602 13.791 12.593 10.946 9.729 8.145 M3.5 91 0
50 BD+18 3421 PM* 17 37 53.3467427850 +18 35 30.160739363 12.315 11.109 9.577 8.599 7.525 M1.5Ve 150 0
51 L 205-128 PM* 17 46 34.2335493264 -57 19 08.560062398 13.613 12.42 10.783 9.648 8.243 M3.5V 70 0
52 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 623 2
53 HD 165222 PM* 18 05 07.5787546501 -03 01 52.753216025 12.09 10.878 9.360 8.385 7.304 M0V 184 0
54 HD 173739 PM* 18 42 46.7048533410 +59 37 49.411785651   10.782   8.1   M3V 327 1
55 HD 173740 PM* 18 42 46.8942178098 +59 37 36.723092516   11.705   8.9   M3.5V 286 1
56 Ross 154 Fl* 18 49 49.3638007809 -23 50 10.453568573 13.528 12.235 10.495 9.278 7.703 M3.5Ve 314 0
57 HD 180617 BY* 19 16 55.2565250393 +05 10 08.038856129 11.768 10.63 9.115 8.076 6.782 M3-V 337 0
58 V* AU Mic BY* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 868 0
59 HD 204961 PM* 21 33 33.9749932664 -49 00 32.403471949 11.359 10.176 8.672 7.665 6.479 M2/3V 197 1
60 HD 209290 PM* 22 02 10.2751729794 +01 24 00.830153206 11.838 10.616 9.146 8.213 7.245 M0.5V 175 0
61 BD-05 5715 PM* 22 09 40.3443754647 -04 38 26.651267098 13.006 11.868 10.366 9.279 7.877 M3.5V 214 1
62 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 829 1
63 L 49-19 PM* 22 55 45.5132862852 -75 27 31.205026497 13.004 11.873 10.377 9.312 7.958 M3V 55 0
64 HD 216899 PM* 22 56 34.8047291749 +16 33 12.353727149 11.323 10.143 8.638 7.657 6.542 M1.5Ve 224 0
65 HD 217987 PM* 23 05 52.0354545522 -35 51 11.058757520   8.82 7.34     M2V 209 0
66 V* BR Psc BY* 23 49 12.5251391270 +02 24 04.403044891 11.532 10.427 8.993 8.029 6.946 M1VFe-1 273 0

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2019.10.22-22:20:40

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