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592 results on '"Kilkenny, D."'

204. On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of λBootis type stars*

Author

Paunzen, E., Handler, G., Weiss, W. W., Nesvacil, N., Hempel, A., Romero-Colmenero, E., Vuthela, F. F., Reegen, P., Shobbrook, R. R., Kilkenny, D., Paunzen, E., Handler, G., Weiss, W. W., Nesvacil, N., Hempel, A., Romero-Colmenero, E., Vuthela, F. F., Reegen, P., Shobbrook, R. R., and Kilkenny, D.

Abstract

Generally, chemical peculiarity found for stars on the upper main sequence excludes δScuti type pulsation (e.g. Ap and Am stars), but for the group of λBootis stars it is just the opposite. This makes them very interesting for asteroseismological investigations. The group of λBootis type stars comprises late B- to early F-type, Population I objects which are basically metal weak, in particular the Fe group elements, but with the clear exception of C, N, O and S. The present work is a continuation of the studies by Paunzen et al. ([CITE], [CITE]), who presented first results on the pulsational characteristics of the λBootis stars. Since then, we have observed 22 additional objects; we found eight new pulsators and confirmed another one. Furthermore, new spectroscopic data (Paunzen [CITE]) allowed us to sort out misidentified candidates and to add true members to the group. From 67 members of this group, only two are not photometrically investigated yet which makes our analysis highly representative. We have compared our results on the pulsational behaviour of the λBootis stars with those of a sample of δScuti type objects. We find that at least 70% of all λBootis type stars inside the classical instability strip pulsate, and they do so with high overtone modes (Q< 0.020 d). Only a few stars, if any, pulsate in the fundamental mode. Our photometric results are in excellent agreement with the spectroscopic work on high-degree nonradial pulsations by Bohlender et al. ([CITE]). Compared to the δScuti stars, the cool and hot borders of the instability strip of the λBootis stars are shifted by about 25 mmag, towards smaller $(b-y)_0$. Using published abundances and the metallicity sensitive indices of the Geneva 7-colour and Strömgren $uvby\beta$systems, we have derived [ Z] values which describe the surface abundance of the heavier elements for the group members. We find that the Period-Luminosity-Colour relation for the group of λBootis stars is within the errors identical with that of the normal δScuti stars. No clear evidence for a statistically significant metallicity term was detected.

Published
2002
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207. Preliminary Results from XCOV 17: PG 1336-018

Author

Reed, M. D., primary, Kilkenny, D., additional, Kawaler, S. D., additional, Mukadam, A., additional, Kleinman, S. J., additional, Nitta-Kleinman, A., additional, Provencal, J. L., additional, Watson, T., additional, Sullivan, D., additional, Sullivan, T., additional, Shobbrook, B., additional, Jiang, X. J., additional, Ashoka, B. N., additional, Seetha, S., additional, Leibowitz, E., additional, Ibbetson, P., additional, Mendelson, H., additional, Meistas, E. G., additional, Kalytis, R., additional, Alisauskas, D., additional, O'Donoghue, D., additional, Martinez, P., additional, Wyk, F. van, additional, Stobie, R., additional, Marang, F., additional, Zola, S., additional, Krzesinski, J., additional, Ogloza, W., additional, Mosaklik, P., additional, Silvotti, R., additional, Piccioni, A., additional, Vauclair, G., additional, Dolez, N., additional, Rene-Fremy, J., additional, Chevreton, M., additional, Ulla, A., additional, Dreizler, S., additional, Schuh, S., additional, Deetjen, J., additional, Solheim, J. E., additional, Perez, J., additional, Suarez, O., additional, Manteiga, M., additional, Burleigh, M., additional, Barstow, M., additional, Kepler, S. O., additional, Kanaan, A., additional, Giovannini, O., additional, Metcalfe, T., additional, and Ostensen, R., additional

Published
2000
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208. The orbital periods of three sdB eclipsing binary systems.

Author

Kilkenny, D.

Subjects
*ECLIPSING binaries, *STAR formation, *DWARF stars, *GRAVITATIONAL waves, *STELLAR evolution
Abstract

Recent timings of eclipses made between 2011 and 2014 are presented for three binary systems with hot subdwarf primary stars, AA Dor, NY Vir and EC 10246-2707. In the case of AA Dor, the period remains constant. In NY Vir, a rapidly pulsating sdBVr with a cool companion, the period change now appears more complex than can be described by a simple quadratic. EC 10246-2707, which has previously appeared to have a constant period, now appears to be showing a significant period increase. The effect of gravitational radiation in HW Vir-like systems is briefly discussed. [ABSTRACT FROM AUTHOR]

Published
2014
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220. The EC 14026 Stars

Author

O'Donoghue, D., primary, Koen, C., additional, Kilkenny, D., additional, Stobie, R. S., additional, Lynas-Gray, A. E., additional, and Kawaler, S. D., additional

Published
1998
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222. The Edinburgh-Cape Blue Object Survey -- I. Description of the survey

Author

Stobie, R. S., primary, Kilkenny, D., additional, O'Donoghue, D., additional, Chen, A., additional, Koen, C., additional, Morgan, D. H., additional, Barrow, J., additional, Buckley, D. A. H., additional, Cannon, R. D., additional, Cass, C. J. P., additional, Cranston, M. R., additional, Drinkwater, M., additional, Hartley, M., additional, Hawkins, M. R. S., additional, Hughes, S., additional, Humphries, C. M., additional, Mac, G. T., additional, McKenzie, P. B., additional, Parker, Q. A., additional, Read, M., additional, Russell, K. S., additional, Savage, A., additional, Thomson, E. B., additional, Tritton, S. B., additional, Waldron, J. D., additional, Warner, B., additional, and Watson, F. G., additional

Published
1997
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232. The MACHO Project Large Magellanic Cloud Variable Star Inventory. IV. New R Coronae Borealis Stars

Author

Alcock, C., primary, Allsman, R. A., additional, Alves, D. R., additional, Axelrod, T. S., additional, Becker, A., additional, Bennett, D. P., additional, Clayton, G. C., additional, Cook, K. H., additional, Freeman, K. C., additional, Griest, K., additional, Guern, J. A., additional, Kilkenny, D., additional, Lehner, M. J., additional, Marshall, S. L., additional, Minniti, D., additional, Peterson, B. A., additional, Pratt, M. R., additional, Quinn, P. J., additional, Rodgers, A. W., additional, Stubbs, C. W., additional, Sutherland, W., additional, and Welch, D. L., additional

Published
1996
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235. The Secrets of EUVE J2056-17.1

Author

Mathioudakis, M., primary, Drake, J.J., additional, Craig, N., additional, Kilkenny, D., additional, Doyle, J.G., additional, Sirk, M., additional, Dupuis, J., additional, Fruscione, A., additional, Christian, C.A., additional, and Abbott, M.J., additional

Published
1996
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