The Inclination of the Soft X-ray Transient A0620-00 and the Mass of its Black Hole - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




The Inclination of the Soft X-ray Transient A0620-00 and the Mass of its Black Hole - Astrophysics > High Energy Astrophysical Phenomena - Download this document for free, or read online. Document in PDF available to download.

Abstract: We analyze photometry of the Soft X-ray Transient A0620-00 spanning nearly 30years, including previously published and previously unpublished data. Previousattempts to determine the inclination of A0620 using subsets of these data haveyielded a wide range of measured values of i. Differences in the measured valueof i have been due to changes in the shape of the light curve and uncertaintyregarding the contamination from the disk. We give a new technique forestimating the disk fraction and find that disk light is significant in alllight curves, even in the infrared. We also find that all changes in the shapeand normalization of the light curve originate in a variable disk component.After accounting for this disk component, we find that all the data, includinglight curves of significantly different shapes, point to a consistent value ofi. Combining results from many separate data sets, we find i=51 plus or minus0.9 degrees, implying M=6.6 plus or minus 0.25 solar masses. Using ourdynamical model and zero-disk stellar VIH magnitudes, we find d=1.06 plus orminus 0.12 kpc. Understanding the disk origin of non-ellipsoidal variabilitymay assist with making reliable determinations of i in other systems, and thefluctuations in disk light may provide a new observational tool forunderstanding the three-dimensional structure of the accretion disk.



Author: Andrew G. Cantrell, Charles D. Bailyn, Jerome A. Orosz, Jeffrey E. McClintock, Ronald A. Remillard, Cynthia S. Froning, Joseph Ne

Source: https://arxiv.org/



DOWNLOAD PDF




Related documents