Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Articles Article Faculty Publications -Articles Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Spectroscopic study of Be-shell stars: 4 Her and 88 Her Subject The topic of the resource emission-line, Be - circumstellar matter - stars; individual (4 Her, 88 Her) - stars; rotation- techniques; spectroscopic; stars Description An account of the resource We present an optical spectroscopic study based on 41 spectra of 4 Her and 32 spectra of 88 Her, obtained over a period of 6 months. We estimate the rotational velocity of these stars from HeI lines in the blue spectral region (4000-4500 . We find that these stars are likely to be rotating at a fractional critical rotation of ?0.80. We measure the average I p/I c ratio to quantify the strength of the H? line and obtain 1.63 for 4 Her and 2.06 for 88 Her. The radius of the H? emission region is estimated to be Rd/R? ?5.0, assuming a Keplerian disk. These stars are thus found to be fast rotators with a relatively small H? emission region. We detect V/R variation of the H? spectral line during the observed period. We re-estimate the periods for both stars and obtain a period of ?46 d and its harmonic of 23.095 d for 4 Her, and a period of ?86 d for 88 Her. As these two cases are shell stars with binaries and have low H? EW with the emission region closer to the central star, the V/R variation and a change in period may be an effect of the binary on the circumstellar disk. 2016 National Astronomical Observatories, Chinese Academy of Sciences and IOP Publishing Ltd. Creator An entity primarily responsible for making the resource Bhat S.S.; Paul K.T.; Subramaniam A.; Mathew B. Source A related resource from which the described resource is derived Research in Astronomy and Astrophysics, Vol-16, No. 5 Publisher An entity responsible for making the resource available Institute of Physics Publishing Date A point or period of time associated with an event in the lifecycle of the resource 2016-01-01 Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.1088/1674-4527/16/5/076" target="_blank" rel="noreferrer noopener">https://doi.org/10.1088/1674-4527/16/5/076</a> <br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964856490&amp;doi=10.1088%2F1674-4527%2F16%2F5%2F076&amp;partnerID=40&amp;md5=31748c9189d0432eee24ed46b5e9a8f7" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-84964856490&amp;doi=10.1088%2f1674-4527%2f16%2f5%2f076&amp;partnerID=40&amp;md5=31748c9189d0432eee24ed46b5e9a8f7</a> Rights Information about rights held in and over the resource All Open Access; Green Open Access Relation A related resource ISSN: 16744527 Format The file format, physical medium, or dimensions of the resource Online Language A language of the resource English Type The nature or genre of the resource Article Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Bhat S.S., Department of Physics, Christ University, Bangalore, 560029, India; Paul K.T., Department of Physics, Christ University, Bangalore, 560029, India; Subramaniam A., Indian Institute of Astrophysics, II Block Kormangala, Bangalore, 560034, India; Mathew B., Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India