ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Unbekannt

Detection of a magnetic region on HR 1099 (1990)

Donati, J.-F. ; Rees, D. E. ; Taylor, K. ; [weitere]

In: Other Sources

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2011-08-19

Beschreibung: The paper reports results of a magnetic field measuring campaign on the active K component of the RS CVn system HR 1099, using Zeeman-Doppler imaging. A localized magnetic field is detected near quadrature (phase 0.85). Assuming this magnetic region has a circular shape, its longitude and latitude are, respectively, estimated to be 86 + or - 4 deg and 5 + or - 5 deg. This equatorial region is largely monopolar, has a mean field strength of 985 + or - 270 G, covers 18 + or - 3 percent of the total stellar surface and may be colocalized with a bright photospheric spot.

Schlagwort(e): ASTROPHYSICS

Materialart: Astronomy and Astrophysics (ISSN 0004-6361); 232; 1, Ju

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X

2

Unbekannt

Conductive flux in the chromosphere derived from line linear polarization observation (1983)

Heristchi, D. ; Shine, D. ; Henoux, J.-C. ; [weitere]

In: Other Sources

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2011-08-18

Beschreibung: It is shown that quantitative information on the mechanisms of energy transport which take place in solar flares can be obtained by measurement of impact line polarization. Linear polarization in two chromospheric lines (H-alpha and SI 1437 A) observed in the gradual phase of solar flares was investigated. The polarized electric vector is shown to be directed towards the center of the disk. The relationship between conductive heat flux and linear line polarization is determined using a function which represents the velocity distribution of electrons carrying heat flux. The relationship between linear polarization and heat flux is applied to the observed degree of polarization, which yields the conductive heat flux in the high chromosphere. It is determined that this conductive flux is of the order of magnitude of the total radiation loss in the chromosphere and below, which is also of the order of magnitude of the conductive flux in the transition zone.

Schlagwort(e): SOLAR PHYSICS

Materialart: (ISSN 0038-0938)

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X

3

Unbekannt

Impact linear polarization observed in a UV chromospheric line during a solar flare (1983)

Beckers, J. ; Woodgate, B. ; Henoux, J. C. ; [weitere]

In: Other Sources

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2011-08-18

Schlagwort(e): SOLAR PHYSICS

Materialart: Astrophysical Journal; vol. 265

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X

4

Unbekannt

Photospheric imaging of the RS CVn system HR 1099 (1992)

Hall, D. S. ; Brown, S. F. ; Henry, G. W. ; [weitere]

In: Other Sources

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2019-07-13

Beschreibung: Spectropolarimetric, spectroscopic, and photometric observations of the RS CVn binary system HR 1099 = V711 Tau (K1IV+G5V) were made from Oct. 1988 to Jan. 1991. From Doppler imaging of the unpolarized spectra and the corresponding data, two maximum entropy images of the temperature distribution of the active K1 subgiant at epochs 1988.9 and 1990.9 were derived. Zeeman-Doppler imaging of the circularly polarized spectra has led to the first magnetic maps of a star other than the sun. The fragmentary observations made at epoch 1989.6 suggest that the star's magnetic field lines were emerging radially and/or poloidally from an equatorial warm region at that time, quite likely one of these reconstructed in the 1988.9 temperature image.

Schlagwort(e): ASTROPHYSICS

Materialart: Astronomy and Astrophysics (ISSN 0004-6361); 265; 2; p. 682-700.

Format: text

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

NASA TECHNICAL REPORTS

S·F·X