1994PASP..106..822M

Query : 1994PASP..106..822M

1994PASP..106..822M - Publ. Astron. Soc. Pac., 106, 822-827 (1994/August-0)

A search for chromospherically active stars from the ROSAT EUV source list.

MULLISS C.L. and BOPP B.W.

Abstract (from CDS):

Optical spectroscopic observations have been made of ten G-, R-, and M-type stars which were detected as EUV sources by the ROSAT Wide Field Camera (WFC). The optical spectra reveal the signatures of enhanced chromospheric activity in nine of the ten stars. H-alpha appears as a partially filled absorption line in seven of nine stars observed in that region and is strongly in emission in two, HD 160934 and Wolf 1225. The strongest line of the Ca II infrared triplet (8542A) appears as a partially filled absorption line in five of six stars observed in that region. Two stars with filled H-alpha and Ca II 8542A lines (BD+48 3686 and HD 171488) were also observed to have a strong Li absorption line at 6707A, suggesting an age less than the age of the Pleiades (7x10^7 years). Two stars were discovered to be double-lined spectroscopic binaries (BD+27 3245 and HD 144110). This work has also identified a previously unreported chromospherically active star with a very strong level of activity, HD 160934.

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Journal keyword(s):

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2417 1
2 V* EV Dra RS* 16 01 47.4594340968 +51 20 52.051615908   9.31 8.59     G5 56 0
3 HD 144515 RS* 16 05 53.4697672013 +10 41 06.745215611 9.35 9.06 8.397 7.8 7.363 G8V 99 0
4 HD 160934 Er* 17 38 39.6170537492 +61 14 16.102424643   11.34 10.15   8.99 K7Ve 107 0
5 * mu.01 Her ** 17 46 27.5472960785 +27 43 14.560978925 4.56 4.17 3.42 2.89 2.51 G5IV 719 0
6 V* V835 Her RS* 17 55 24.6805160856 +36 11 19.933915920   8.81 7.92     G5 86 0
7 * tet Her V* 17 56 15.1809747319 +37 15 01.932000161 6.70 5.23 3.88 2.98 2.38 K1IIaCN2 226 0
8 HD 166435 PM* 18 09 21.3816898440 +29 57 06.166145376   7.457 6.829     G1IV 203 0
9 V* V889 Her BY* 18 34 20.1028767504 +18 41 24.234675864   8.00 7.449   6.720 G2V 151 0
10 V* V511 Lyr RS* 19 06 21.3089168568 +27 42 47.825228124       8.4   K0 36 0
11 * eps Cyg ** 20 46 12.6722768426 +33 58 13.182037125 4.370 3.520 2.480 1.73 1.19 K0III 519 0
12 V* V383 Lac BY* 22 20 07.0254050808 +49 30 11.767337496   9.42 8.58     K1V 85 0
13 Wolf 1225 ** 22 23 29.09743 +32 27 33.9152       10.26   M3.0V 111 0
14 HD 217411 ** 23 00 35.6323 -07 04 09.138   10.36 9.71     G3V+K0V+DA 46 0

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