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HD 150431


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Spectropolarimetry of high-polarization Seyfert 2 galaxies and unified Seyfert theories
Spectropolarimetry was used to study eight high-polarization Seyfert 2galaxies. In four of them (Mrk 3, Mrk 348, Mrk 463E, and NGC 7674),evidence was found for a hidden broad-line region (BLR), visible only inthe polarized flux spectrum. The other four objects, Mrk 78, Mrk 1066,NGC 591, and NGC 7672, may also have hidden BLRs, but at a flux levelbelow the detection threshold. The properties of the hidden BLRs areconsistent with their normal Seyfert 1 nuclei. If all Seyfert 2 galaxiesare in reality Seyfert 1 galaxies in which the nuclei are hidden fromdirect view and seen only in scattered light, then one might expect thatmany Seyfert 2 galaxies have polarizations of their featureless continuagreater than 50 percent. Such high polarization are not seen, perhapsindicating a particular geometry, in which nearly edge-on obscuring torialso block light from the scattering region. This model predicts that,in edge-on cases, little or no featureless continua in the spectra ofthe objects will be detected. Arguments are presented that objects withhigh luminosity, such as QSOs, have geometrically thin tori and henceare much less likely to have obscured continua and BLRs.

Photoelectric photometry of selected AG stars in the 25D to 30D zone.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1968AJ.....73..187B&db_key=AST

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观测天体数据

星座:武仙座
右阿森松:16h40m00.65s
赤纬:+25°32'06.9"
视星:8.322
距离:318.471 天文距离
右阿森松适当运动:-6.4
赤纬适当运动:-5.5
B-T magnitude:9.55
V-T magnitude:8.424

目录:
适当名称   (Edit)
HD 1989HD 150431
TYCHO-2 2000TYC 2049-697-1
USNO-A2.0USNO-A2 1125-07748314
HIPHIP 81607

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