2009A&A...503..929H


Query : 2009A&A...503..929H

2009A&A...503..929H - Astronomy and Astrophysics, volume 503, 929-944 (2009/9-1)

Observation and modelling of main sequence star chromospheres. VIII. High resolution observations of M and K dwarf chromospheric lines.

HOUDEBINE E.R., JUNGHANS K., HEANUE M.C. and ANDREWS A.D.

Abstract (from CDS):

We report on high resolution observations of chromospheric lines for M and K dwarfs. We observed up to 13 spectral lines per star: the Hα, Hβ, Hε, Paε, Pa8, CaII H, CaII IR triplet, CaI 6572Å, NaI D1/D2 and HeI D3 lines. We observed two dMe stars, one dM(e) star, 5 dM stars and 3 dK stars. We observed a self-reversal in the emission core of the CaII H line for the brightest stars only, indicating a rather optically thick region of formation. We present original spectra of the NaI doublet and the CaII IR triplet for active dMe stars and less active dM stars. Core emission is detected in the Sodium lines and the CaII IR triplet lines for the most active M dwarf AU Mic. We investigate the difference spectra between active dMe stars and dM stars and show that these provide interesting new constraints for the NLTE-radiation transfer modelling of the chromospheres. In our sample, emission Hα profiles have a rather homogeneous FWHM of about 1.5Å. This, according to our previous modelling, can be interpreted as the signature of a rather constant temperature break in the chromosphere. We found that one of our targets (MCC 332) is a binary with a faint but active Hα emission component. For the first time we detect the Paε line for six dwarfs. It appears as weak absorption with possible weak wing emission in AU Mic. The region of the Pa8 line was observed but the line was not detected.

Abstract Copyright:

Journal keyword(s): stars: late-type - stars: activity - stars: chromospheres - stars: magnetic fields

Simbad objects: 22

goto Full paper

goto View the references in ADS

Number of rows : 22
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 8946 * 01 29 19.1609487952 +54 21 31.370762790   8.86 8.69     A0 7 0
2 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1769 1
3 V* V1005 Ori BY* 04 59 34.8341800543 +01 47 00.672080375   11.48 10.107 9.603 8.239 M0Ve 318 0
4 HD 36395 PM* 05 31 27.3958475290 -03 40 38.021551815 10.626 9.443 7.968 6.996 5.913 M1.5Ve 459 0
5 BD+20 2465 Er* 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   dM3 1206 0
6 HD 111631 PM* 12 50 43.5668069413 -00 46 05.267056898 11.187 9.892 8.470 7.59 6.752 M0V 210 0
7 HD 118100 Er* 13 34 43.2063348511 -08 20 31.335294003 11.578 10.552 9.372 8.602 7.930 K5Ve 331 0
8 HD 119850 Er* 13 45 43.7754528655 +14 53 29.473195472 10.989 9.894 8.50 7.465 6.363 M2V 310 0
9 CD-40 9712 PM* 15 32 12.9326267337 -41 16 32.131578815 11.918 10.815 9.311 8.265 6.947 M2.5V 125 0
10 HD 152751 SB* 16 55 25.2222456607 -08 19 21.296969682 11.647 10.593 9.023 7.937 6.565 M3.5Ve 498 1
11 * 36 Oph ** 17 15 20.9839376 -26 36 10.157115           K2V+K1V 122 0
12 V* V2215 Oph RS* 17 16 13.3627374963 -26 32 46.133091527   7.50 6.34   4.8 K5V 287 0
13 Ross 154 Er* 18 49 49.3638007809 -23 50 10.453568573 13.528 12.19 10.43 10.23 7.703 M3.5Ve 339 0
14 V* AU Mic LM* 20 45 09.5323695486 -31 20 27.241710746   10.05 8.627 9.078 6.593 M1VeBa1 973 0
15 * 61 Cyg ** 21 06 53.95 +38 44 57.9           ~ 164 0
16 * 61 Cyg B Er* 21 06 55.2640651855 +38 44 31.362140913 8.63 7.40 6.03 4.86 3.55 K7V 685 1
17 BD-05 5480 ** 21 08 45.4902104001 -04 25 36.493307291   10.62 9.43     M1 51 0
18 V* AX Mic Er* 21 17 15.2688576495 -38 52 02.510022611   8.09 6.68     M1V 211 0
19 V* EV Lac Er* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 832 2
20 HD 217357 PM* 23 00 16.1224771183 -22 31 27.651428500 10.494 9.251 7.869 7.014 6.238 K7+Vk 165 0
21 HD 217987 PM* 23 05 52.0354545522 -35 51 11.058757520   8.83 7.39     M2V 237 0
22 V* BR Psc BY* 23 49 12.5251391270 +02 24 04.403044891 11.532 10.427 8.993 8.029 6.946 dM1 300 0

To bookmark this query, right click on this link: simbad:objects in 2009A&A...503..929H and select 'bookmark this link' or equivalent in the popup menu


2021.12.07-08:12:00

© Université de Strasbourg/CNRS

    • Contact