H i and optical spectroscopy towards the M15 intermediate-velocity cloud

Autor:	J. V. Smoker, N. Lehner, F. P. Keenan, E. J. Totten, E. Murphy, K. R. Sembach, R. D. Davies, B. Bates
Rok vydání:	2001
Předmět:	Physics Radial velocity Stars Space and Planetary Science Globular cluster Magnitude (astronomy) Cluster (physics) Astronomy and Astrophysics Astrophysics Absorption (electromagnetic radiation) Spectroscopy Spectrograph
Zdroj:	Monthly Notices of the Royal Astronomical Society. 322:13-21
ISSN:	1365-2966 0035-8711
DOI:	10.1046/j.1365-8711.2001.03999.x
Popis:	We present echelle spectrograph observations in NaD, at resolutions of 6.2-8.5 km/s, for 11 stars located in the line-of-sight to the M15 intermediate velocity cloud, which has a radial velocity of 70 km/s. This cloud is a part of IVC Complex gp. The targets range in magnitude from V=13.3-14.8. Seven of the observed stars are in the M15 globular cluster, the remaining four being field stars. Column density ratios of log(N cm^-2)=11.8-12.5 are derived. Combining the current sightlines with previously-existing data, we find the NaD/HI ratio in the IVC varies by upto a factor of 25. One cluster star, M15 ZNG-1, was also observed in Calcium. We find N(CaI)/N(CaII)
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ca5819a7e474e6c81748c857f85a473a https://doi.org/10.1046/j.1365-8711.2001.03999.x Zobrazit plný text záznamu Plný text