Photoelectric equivalent widths of the O I lambda 7774 line and M/sub upsilon/'s of selected F supergiants
Journal Article
·
· Publ. Astron. Soc. Pac., v. 86, no. 509, pp. 33-37
OSTI ID:4308781
Photoelectric scanner measurements of the equivalent width of the O I lambda 7774 triplet, for 52 F supergiants brighter than m/sub nu / = 9.0, are presented. The linear relation between the equivalent width and absolute visual magnitudes found by Osmer (1972) for 10 stars with known distances is confirmed and this calibration is used to find the absolute visual magnitudes of 51 F supergiants. A comparison of the equivalent widths for 17 stars in common with Osmer shows a good agreement, on the average. Stars of class F5 Ib- F9 Ib show a decreasing equivalent width with advancing type, in agreement with spectroscopic evidence. (auth)
- Research Organization:
- Univ. of California, Santa Cruz
- NSA Number:
- NSA-29-030296
- OSTI ID:
- 4308781
- Journal Information:
- Publ. Astron. Soc. Pac., v. 86, no. 509, pp. 33-37, Journal Name: Publ. Astron. Soc. Pac., v. 86, no. 509, pp. 33-37; ISSN PASPA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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