The spectra of late-type dwarfs and sub-dwarfs in the near ultraviolet. III - an atlas of MG II H and K profiles

Franco, M. L.; Crivellari, L.; Molaro, P.; Vladilo, G.; Ramella, M.; Morossi, C.; Allocchio, C.; Beckman, J. E.
Referencia bibliográfica

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 58, Dec. 1984, p. 693-704.

Fecha de publicación:
12
1984
Número de autores
8
Número de autores del IAC
0
Número de citas
12
Número de citas referidas
11
Descripción
Using a radically new suite of data extraction routines, IUEARM, high resolution IUE spectra of six F and G stars, taken at regular intervals since 1978 are analysed. The salient features of the new routines are: reduction of interorder scattering via two-dimensional deconvolution of the echelle spectrograph image plane, with high frequency filtering, to reduce the effects of the instrument function; enhanced spectral resolution by data extraction using a small pseudo-slit; improved "ripple correction" yielding mutually consistent inter-order overlap regions; and an improved absolute calibration. Rigorous limits, twice as precise as any previously available, are set on weak spectral features, and on possible variability of the h and k chromospheric emission cores in the G stars. The authors show how the interstellar Mg II components of the stars can be abstracted and used to examine a sector of the local interstellar medium.