Time-resolved photometric and spectroscopic analysis of a luminous Ap star HD103498 - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: We present the results on the photometric and spectroscopic monitoring of aluminous Ap star HD103498. The time-series photometric observations werecarried out on 17 nights using three-channel fast photometer attached to the1.04-m optical telescope at ARIES, Nainital. The photometric data of fivenights of year 2007 show clear signature of 15-min periodicity. However, thefollow-up observations during 2007-2009 could not repeated any suchperiodicity. To confirm the photometric light variations, the time-seriesspectroscopic observations were carried out with the 2.56-m Nordic OpticalTelescope NOT at La Palma on February 2, 2009. Any radial velocity variationswere absent in this data set which is in full agreement with the photometricobservations taken near the same night. Model atmosphere and abundance analysisof HD103498 show that the star is evolved from the Main Sequence and itsatmospheric abundances are similar to two other evolved Ap stars HD133792 andHD204411: large overabundances of Si, Cr, and Fe and moderate overabundances ofthe rare-earth elements. These chemical properties and a higher effectivetemperature distinguish HD103498 from any known roAp star.



Author: S. Joshi 1, T. Ryabchikova 2,3, O. Kochukhov 4, M. Sachkov 2, S. K. Tiwari 1, N. K. Chakradhari 5, N. Piskunov 4

Source: https://arxiv.org/







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