Articles written in Journal of Astrophysics and Astronomy
Volume 9 Issue 2 June 1988 pp 107-116
Analysis of the available observational data for the α-Persei cluster members shows that rotation effects on the intermediate-band indices c1 and (
The binaries and peculiar stars are found to behave differently in the colour excess (due to rotation) versus
Volume 11 Issue 2 June 1990 pp 167-191
Volume 13 Issue 1 March 1992 pp 61-107
The observed slopes of the rotation effects were used to determine the zero rotation main sequence values of the intermediate band photometric indices for selected clusters. We also corrected the observed indices for each star in each cluster using the theoretical predictions of Collins and Sonneborn and derived the ZRMS values for each cluster. The agreement between the two determinations is found to be good. The various ZRMS curves were utilised to derive the ZRZAMS values. A preliminary calibration of the absolute visual magnitudes as a function of α valid for ZRZAMS has also been derived. The ZRMS values of the intermediate band photometric indices for different clusters and the ZRZAMS values are listed as a function of α.
Volume 13 Issue 1 March 1992 pp 109-128
The effect of rotation on the observed colours of stars has been considered as a possible cause for the blue straggler phenomenon in clusters listed by Mermilliod (1982). It appears that this phenomenon is definitely not real in the case of the late B and early A spectral type blue stragglers that are intrinsic slow rotators. Among clusters containing the early B type blue stragglers it is found that the anomalous position of the stragglers in NGC 6633, NGC 6475 and NGC 2516 cannot be accounted for by rotation effects alone.
Volume 41, 2020
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