1997A&AS..125..263M


Query : 1997A&AS..125..263M

1997A&AS..125..263M - Astron. Astrophys., Suppl. Ser., 125, 263-287 (1997/October-2)

Multiwavelength optical observations of chromospherically active binary systems. I. Simultaneous Hα, Na I D1, D2, and He I D3 observations.

MONTES D., FERNANDEZ-FIGUEROA M.J., DE CASTRO E. and SANZ-FORCADA J.

Abstract (from CDS):

This is the first paper of a series aimed at studying the chromosphere of active binary systems using the information provided for several optical spectroscopic features. Simultaneous Hα, Na I D1, D2, and He I D3 spectroscopic observations are reported here for 18 systems. The chromospheric contribution in these lines have been determined using the spectral subtraction technique. Very broad wings have been found in the subtracted Hα profile of some of the more active stars. These profiles are well matched using a two-components Gaussian fit (narrow and broad) and the broad component could be interpreted as arising from microflaring. Prominence-like extended material have been detected in a near-eclipse Hα observation of the system AR Lac. The excess emission found in the Na I D1 and D2 lines by application of the spectral subtraction technique and the behaviour of the Hα line in the corresponding simultaneous observations indicate that the filling-in of the core of these lines is a chromospheric activity indicator. For giant stars of the sample the He I D3 line has been detected in absorption in the subtracted spectra. An optical flare has been detected in UX Ari and II Peg through the presence of the He I D3 in emission in coincidence with the enhancement of the Hα emission.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: binaries: close - stars: chromospheres - stars: flare - stars: late-type

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* BD Cet RS* 00 22 46.3323591861 -09 13 51.074156366   9.09 7.978   6.770 K1IIIe+F 59 0
2 * 39 Cet RS* 01 16 36.2882494986 -02 30 01.329588503   6.310 5.428     G6III:eFe-2 246 0
3 HD 8357 XB* 01 22 56.7569725665 +07 25 09.324761789 8.530 8.160   6.8   G5 158 0
4 V* XX Tri RS* 02 03 47.1138016857 +35 35 28.669244792   9.52 8.42     K0III 121 0
5 V* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 669 0
6 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1137 0
7 HD 283750 BY* 04 36 48.2413370074 +27 07 55.898311812   9.354   7.4   K2.5Ve 259 2
8 V* V1149 Ori RS* 05 41 26.7879828728 +03 46 40.929159334   7.96 6.82     K0III 86 0
9 V* VV Mon RS* 07 03 18.2888493062 -05 44 15.522872209 10.51 10.21 9.40   8.593 G0 116 0
10 V* DM UMa RS* 10 55 43.5440100939 +60 28 09.722249634   10.31 9.29     K0III-IV 159 0
11 V* MM Her RS* 17 58 38.5192261661 +22 08 46.786202620   9.24 9.563 8.01 8.574 G0 132 0
12 V* V815 Her RS* 18 08 16.0466708534 +29 41 28.298657106   8.40 7.70     G5 134 0
13 V* BY Dra BY* 18 33 55.7719224141 +51 43 08.903033617 10.22 9.23   8.733   K4Ve+K7.5Ve 599 0
14 HD 175742 RS* 18 55 53.2251373830 +23 33 23.929225997 9.524 8.941 8.019 7.483 6.958 K0V 178 0
15 V* V478 Lyr RS* 19 07 32.3867188674 +30 15 16.176365783   8.54   7.3   G6V 119 0
16 V* HK Lac RS* 22 04 56.6089126762 +47 14 04.482220545   8.01 6.96     K0III 233 0
17 V* AR Lac RS* 22 08 40.8180372773 +45 44 32.104045703 7.09 6.83 6.11     K0IVe+G5IV 701 0
18 V* KZ And BY* 23 09 57.3641653876 +47 57 30.042914842   8.841 7.912     K2-Ve 122 0
19 V* KT Peg RS* 23 39 30.9714449781 +28 14 47.405331910   7.71   6.6   G8 90 0
20 HD 224085 RS* 23 55 04.0516465022 +28 38 01.248194500 8.88 8.20   6.9   K2+IVeFe-1 694 0

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2021.09.19-15:30:22

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