• Issue front cover thumbnail

      Volume 31, Issue 4

      December 2010,   pages  177-224

    • Carbon Stars

      T. Lloyd Evans

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      In this paper, the present state of knowledge of the carbon stars is discussed. Particular attention is given to issues of classification, evolution, variability, populations in our own and other galaxies, and circumstellar material.

    • Could the Optical Transient SCP 06F6 be due to Microlensing?

      Marek Biesiada

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      In this paper, we consider the mysterious optical transient SCP 06F6 displaying a symmetric light curve with a (half-time) duration of about 100 days. The projected location of the event falls close to the center of the galaxy cluster CL 1432.5 + 332.8 lying at the redshift 𝑧 = 1.112. Guided by suggestive symmetry of the light curve and its similarity in two photometric bands, which is a typical signature of microlensing events, we discuss this possibility in several scenarios. As a consistency check we use the lens mass inferred from the event duration and the size of the source. The second check comes from a plausible assumption that since the event was highly magnified there was a perfect alignment at the maximum magnification.

      A scenario where the lens and the source are located in our Galaxy is ruled out. There remain extragalactic scenarios in which the source is a broad absorption line quasar at redshift 2.7 (as might be suggested by transient’s spectroscopy) and the lens could be a compact object associated either with the cluster or with quasar’s host galaxy. They give reasonable results.

      Even if the true nature of the transient eventually turns out different, the idea presented here is interesting from the perspective of cosmological microlensing studies.

    • Author Index

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    • Subject Index

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  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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