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מאמרים קשורים
Radio continuum emission from stars: a catalogue update.
An updated version of my catalogue of radio stars is presented. Somestatistics and availability are discussed.
| A 1.5 GHz radio survey of the Hyades open stellar cluster
Results of a radio survey of the Hyades open stellar cluster carried outwith the VLA at 1.5 GHz are reported. Seventeen fields containing over150 cataloged stars were mapped down to a limiting sensitivity rangingfrom 0.3 mJy at the centers of the fields to 0.9 mJy at a distance of 20arcmin from field centers. Two stars were detected as radio sources: theevolved spectroscopic binary V471 Tau, consisting of a white dwarf and ared dwarf; and the apparently premain-sequence G+K star spectroscopicbinary HD 27130. The failure to detect any single stars as radio sourcesis generally consistent with the age-rotation-activity paradigm,according to which stellar activity is due to magnetic fields producedby dynamo action in rapidly rotating stars and should decrease with ageas a star spins down due to magnetic braking. It is concluded that theHyades M dwarf population is not more active at radio wavelengths thanthe nearby flare star population, or else the number of flare stars inthe Hyades is much less than presently assumed.
| Helligkeiten und Eigenbewegungen in den Hyaden. Mit 6 Textabbildungen
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | שור |
| התרוממות ימנית: | 04h24m21.75s |
| סירוב: | +14°42'42.7" |
| גודל גלוי: | 9.819 |
| תנועה נכונה: | -6.7 |
| תנועה נכונה: | -13.6 |
| B-T magnitude: | 10.44 |
| V-T magnitude: | 9.871 |
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