English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

(Abridged) We present the results of high S/N long-slit spectroscopy with theMultiple Mirror and the SAO 6-m telescopes, optical imaging with the Wise 1-mtelescope and HI observations with the Nancay Radio Telescope of the verymetal-deficient (12+log(O/H)=7.64) luminous (M_B=-18.1) blue compact galaxy(BCG) HS 0837+4717. The blue bump near lambda4650, characteristic of WR starsis detected in the central supergiant HII region, as well as the barely seenred bump at lambda5808. The derived number of WR stars in the region of thecurrent starburst is ~1000. Evidence for fast motions in this region is alsoseen as broad, low-contrast components in the Ha, Hb and strong [OIII] lines.While the extinction of the narrow emission lines from the supergiant HIIregion is low, the very large Balmer decrement of the broad components suggeststhat the part of current starburst is highly obscured by dust. Abundance ratiosX/O for X=Ne, Ar, S, Fe and Cl in the supergiant HII region are in goodagreement with the mean values of other BCGs. Nitrogen, however, isoverabundant by a factor of ~6. This implies an unusually efficient Nenrichment in HS 0837+4717, and probably, a non-typical evolution scenario. TheHa-line Position--Velocity diagrams for directions approximately along themajor and minor axes reveal disturbed motions of the ionized gas. The SW partof the major axis P--V diagram looks like a rotation curve, with V_rot ~50--70km/s at r=4.3 kpc. Its NE part displays, however, strong deviations, indicatingeither counter-rotation, or strong outflow/supershell. The overall BCGmorphology is highly disturbed. With a "double-nucleus" structure, disturbedvelocities of ionized gas, and the very high power of the starburst thissuggests a possible explanation of the object as a recent merger.Comment: 16 pages, 6 figures. Accepted for publication in Astron.Astrophy

HS 0837+4717 – a metal-deficient blue compact galaxy with large nitrogen excess