Contenuti
Immagini
Carica la tua immagine
DSS Images Other Images
Articoli relazionati
Einstein Observatory magnitude-limited X-ray survey of late-type giant and supergiant stars
Results are presented of an extensive X-ray survey of 380 giant andsupergiant stars of spectral types from F to M, carried out with theEinstein Observatory. It was found that the observed F giants orsubgiants (slightly evolved stars with a mass M less than about 2 solarmasses) are X-ray emitters at the same level of main-sequence stars ofsimilar spectral type. The G giants show a range of emissions more than3 orders of magnitude wide; some single G giants exist with X-rayluminosities comparable to RS CVn systems, while some nearby large Ggiants have upper limits on the X-ray emission below typical solarvalues. The K giants have an observed X-ray emission level significantlylower than F and F giants. None of the 29 M giants were detected, exceptfor one spectroscopic binary.
| Photoelectric photometry of late type stars in the direction opposed to galactic rotation
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974A&AS...16..269G&db_key=AST
|
Sottometti un nuovo articolo
Link relazionati
Sottometti un nuovo link
Membro dei seguenti gruppi:
|
Osservazione e dati astrometrici
| Costellazione: | Vele |
| Ascensione retta: | 09h23m05.98s |
| Declinazione: | -53°49'12.6" |
| Magnitudine apparente: | 6.817 |
| Distanza: | 246.914 parsec |
| Moto proprio RA: | -8.8 |
| Moto proprio Dec: | 7.5 |
| B-T magnitude: | 8.121 |
| V-T magnitude: | 6.925 |
Cataloghi e designazioni:
|
