Abstract
view Abstract Citations (94) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Supernova remnants and H II regions in M31 Dennefeld, M. ; Kunth, D. Abstract New spectroscopic data obtained on SNR candidates and H II regions in M31 are used to confirm the SNR diagnostic and to derive abundances. With all data available in the literature, confirmation is obtained for 12 SNR from a detailed study of some characteristic line ratios. In the absence of a direct temperature determination for the H II regions and the SNR, empirical methods are used to derive oxygen and nitrogen abundances. While N/H and N/O gradients are present with values comparable to the ones found in our Galaxy, no evidence exists for one in oxygen, in view of the large uncertainties in the abundance determinations. The SN rate is found to be about one in 200 yr, at variance with the higher rate (one every 40 yr) found from SN statistics. The difference between the two determinations is found to be smaller in M33. Publication: The Astronomical Journal Pub Date: July 1981 DOI: 10.1086/112974 Bibcode: 1981AJ.....86..989D Keywords: Abundance; Andromeda Galaxy; Astronomical Spectroscopy; H Ii Regions; Supernova Remnants; Line Spectra; Nitrogen; Oxygen; Stellar Spectra; Astronomy full text sources ADS | data products NED (1)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
