J/A+A/379/976 Moving groups late-type stars eq. widths + fluxes (Montes+ 2001)
Chromospheric activity, lithium and radial velocities of single late-type
stars possible members of young moving groups.
Montes D., Lopez-Santiago J., Fernandez-Figueroa M.J., Galvez M.C.
<Astron. Astrophys. 379, 976 (2001)>
=2001A&A...379..976M 2001A&A...379..976M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, late-type ; Equivalent widths
Keywords: stars: activity - stars: chromospheres - stars: late-type -
stars: abundances - stars: kinematic -
open clusters and associations: general
Description:
We present here high resolution echelle spectra taken during three
observing runs of 14 single late-type stars identified in our previous
studies (Montes et al. 2001b, hereafter Paper I) as possible members
of different young stellar kinematic groups (Local Association
(20-150Myr), Ursa Major group (300Myr), Hyades supercluster (600Myr),
and IC 2391 supercluster (35 Myr)). Radial velocities have been
determined by cross correlation with radial velocity standard stars
and used together with precise measurements of proper motions and
parallaxes taken from Hipparcos (Cat. I/239) and Tycho-2 (Cat.
I/259) Catalogues, to calculate Galactic space motions (U, V, W) and
to apply Eggen's kinematic criteria. The chromospheric activity level
of these stars have been analysed using the information provided for
several optical spectroscopic features (from the CaII H & K to CaII
IRT lines) that are formed at different heights in the chromosphere.
The LiI(6707.8Å) line equivalent width (EW) has been determined and
compared in the EW(LiI) versus spectral type diagram with the EW(LiI)
of stars members of well-known young open clusters of different ages,
in order to obtain an age estimation. All these data allow us to
analyse in more detail the membership of these stars in the different
young stellar kinematic groups. Using both, kinematic and
spectroscopic criteria we have confirmed PW And, V368 Cep, V383 Lac,
EP Eri, DX Leo, HD 77407, and EK Dra as members of the Local
Association and V834 Tau, pi1 UMa, and GJ 503.2 as members of the Ursa
Major group. A clear rotation-activity dependence has been found in
these stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 55 28 Star positions and magnitudes (from Simbad)
table1.dat 62 63 Observing log for active and reference stars
table4.dat 87 49 Equivalent widths of the different chromospheric
activity indicators
table5.dat 90 49 Absolute surface flux of the different
chromospheric activity indicators
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See also:
J/MNRAS/328/45 : Late-type stars members of young groups (Montes+, 2001)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the star
15- 16 I2 h RAh Right ascension (J2000.0)
18- 19 I2 min RAm Right ascension (J2000.0)
21- 24 F4.1 s RAs Right ascension (J2000.0)
26 A1 --- DE- Declination sign (J2000.0)
27- 28 I2 deg DEd Declination (J2000.0)
30- 31 I2 arcmin DEm Declination (J2000.0)
33- 34 I2 arcsec DEs Declination (J2000.0)
38- 42 F5.2 mag Bmag ? B magnitude
44- 48 F5.2 mag Vmag ? V magnitude
50- 59 A10 --- SpType Spectral type
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the star
10- 13 A4 --- n_Name Association (1)
14 A1 --- Std [*] *: Radial velocity standard stars
16- 17 I2 d Day1 ? Day of the observation (2.2m Foces 1999/07)
19- 20 I2 h UT1h ? UT of the observation (2.2m Foces 1999/07)
21 A1 --- --- [:]
22- 23 I2 min UT1m ? UT of the observation (2.2m Foces 1999/07)
25- 26 I2 --- S/N1(H+K) ? S/N in H&K region (2.2m Foces 1999/07)
28- 30 I3 --- S/N1(Ha) ? S/N in Halpha region (2.2m Foces 1999/07)
32- 33 I2 d Day2 ? Day of the observation (NOT-SOFIN 1999/11)
35- 36 I2 h UT2h ? UT of the observation (NOT-SOFIN 1999/11)
37 A1 --- --- [:]
38- 39 I2 min UT2m ? UT of the observation (NOT-SOFIN 1999/11)
41- 42 I2 --- S/N2(H+K) ? S/N in H&K region (NOT-SOFIN 1999/11)
44- 46 I3 --- S/N2(Ha) ? S/N in Halpha region (NOT-SOFIN 1999/11)
48- 49 I2 d Day3 ? Day of the observation (INT-MUSICOS 2000/01)
51- 52 I2 h UT3h ? UT of the observation (INT-MUSICOS 2000/01)
53 A1 --- --- [:]
54- 55 I2 min UT3m ? UT of the observation (INT-MUSICOS 2000/01)
57- 59 I3 --- S/N3(Ha) ? S/N in Halpha region (INT-MUSICOS 2000/01)
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Note (1): Association from which the stars are confirmed members:
LA: Local Association
HS: Hyades supercluster
IC: IC 2391
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the star
11- 17 A7 --- Obs Observing Run
19- 28 F10.4 d MJD Modified Julian date of the observation
30- 33 F4.2 0.1nm EWK ? K CaII equivalent width in the
substracted spectrum
35- 38 F4.2 0.1nm EWH ? H CaII equivalent width in the
substracted spectrum
40- 43 F4.2 0.1nm EWHe ? Hε equivalent width in the
substracted spectrum
45- 48 F4.2 0.1nm EWHd ? Hδ equivalent width in the
substracted spectrum
50- 53 F4.2 0.1nm EWHg ? Hγ equivalent width in the
substracted spectrum
55- 58 F4.2 0.1nm EWHb ? Hβ equivalent width in the
substracted spectrum
60- 63 F4.2 0.1nm EWHa ? Hα equivalent width in the
substracted spectrum
65- 68 F4.2 0.1nm EWIRT1 ? CaII IRT 8498 equivalent width in the
substracted spectrum
70- 73 F4.2 0.1nm EWIRT2 ? CaII IRT 8542 equivalent width in the
substracted spectrum
75- 78 F4.2 0.1nm EWIRT3 ? CaII IRT 8662 equivalent width in the
substracted spectrum
80- 85 A6 --- Ref Name of the reference star used in the
substraction
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name of the star
11- 17 A7 --- Obs Observing Run
19- 28 F10.4 d MJD Modified Julian date of the observation
30- 34 F5.3 [0.1nm*mW/m2] logK ? log(EW(K CaII)*F(K CaII)) (1)
36- 40 F5.3 [0.1nm*mW/m2] logH ? log(EW(H CaII)*F(H CaII)) (1)
42- 46 F5.3 [0.1nm*mW/m2] logHe ? log(EW(Hepsilon)*F(Hepsilon)) (1)
48- 52 F5.3 [0.1nm*mW/m2] logHd ? log(EW(Hdelta)*F(Hdelta)) (1)
54- 58 F5.3 [0.1nm*mW/m2] logHg ? log(EW(Hgamma)*F(Hgamma)) (1)
60- 64 F5.3 [0.1nm*mW/m2] logHb ? log(EW(Hbeta)*F(Hbeta)) (1)
66- 70 F5.3 [0.1nm*mW/m2] logHa ? log(EW(Halpha)*F(Halpha)) (1)
72- 76 F5.3 [0.1nm*mW/m2] logIRT1 ? log(EW(IRT 8498)*F(IRT 8498)) (1)
78- 82 F5.3 [0.1nm*mW/m2] logIRT2 ? log(EW(IRT 8542)*F(IRT 8542)) (1)
84- 88 F5.3 [0.1nm*mW/m2] logIRT3 ? log(EW(IRT 8662)*F(IRT 8662)) (1)
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Note (1): Flux units = erg/s/cm2
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Acknowledgements: D. Montes
References:
Montes et al., Paper I 2001MNRAS.328...45M 2001MNRAS.328...45M, (singles)
Montes et al., Paper II 2002MNRAS.......... 2002MNRAS.........., (binaries), in press
the star Catalogue Web site is:
www.ucm.es/info/Astrof/skg/skg_catalogue.html
(End) Patricia Bauer [CDS] 12-Oct-2001