1994A&A...289..893S

Query : 1994A&A...289..893S

1994A&A...289..893S - Astronomy and Astrophysics, volume 289893-898 (1994/9-3)

The corona of the G-type giant HR 2554: discovery of co-existing, very different temperature regimes.

SCHROEDER K.-P. and HUENSCH M.

Abstract (from CDS):

We present direct observational evidence for two different co-existing coronal temperature regimes in the ζ Aur-type binary HR 2554 (G7II + A1V). ROSAT observations reveal the presence of plasma at temperatures around 106.7K, typical of coronal plasma found in giants, while IUE observations, taken during egress from eclipse, show circumstellar (CS) C IV and Si IV absorption lines in the spectrum of the secondary, which reveal a significant amount of geometrically extended (0<h<1R*) plasma in the temperature regime of about 105K, similar to that found in HR 6902.

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Journal keyword(s): stars: binaries: eclipsing - stars: binaries: spectroscopic - stars: chromospheres - stars: coronae - stars: individual: HR 2554

Simbad objects: 7

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Number of rows : 7
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 * tau Per SB* 02 54 15.4777208304 +52 45 44.882735292 5.17 4.71 3.96 3.33 2.89 G8III+A7V 175 0
2 * sig Aur * 05 24 39.1414789752 +37 23 07.256761044   6.435 4.996     K3IIICN+2 68 0
3 V* V415 Car SB* 06 49 51.3137388874 -53 37 20.821466291   5.323 4.408     G4II 84 0
4 HD 169689 SB* 18 25 38.7990783216 +08 01 55.225743564   6.545 5.665     G9II+B9V 111 0
5 * 31 Cyg SB* 20 13 37.9082370480 +46 44 28.761618048 5.50 5.08 3.80 2.83 2.07 K3Ib+B2IV-V 385 0
6 * omi02 Cyg SB* 20 15 28.3242122880 +47 42 51.213932496 6.54 5.50 3.98 2.78 1.86 K7Ib-II+B1V 347 0
7 * 22 Vul SB* 20 15 30.2386386720 +23 30 32.051069712   6.192 5.176     G3Ib-II 215 0

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