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

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

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26as...58..693f&link_type=abstract

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

Astronomy and Astrophysics

Astrophysics

11

Dwarf Stars, Late Stars, Stellar Spectra, Ultraviolet Spectra, Calibrating, Chromosphere, H Lines, Iue, K Lines, Magnesium, Near Ultraviolet Radiation

Scientific paper

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.

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