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TYC 7313-907-1


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On the infrared void in the Lupus dark clouds
Strömgren uvbyβ photometry observations obtained for 205 starsin the general direction of a void in the IRAS 100-μm emission fromthe Lupus dark cloud complex are presented and analysed. The colourexcess versus distance diagram confirms the existence of a regiondepleted from interstellar material, which is also seen in the ROSATsoft X-ray background emission map. The distance to the surroundingmaterial is estimated as being within the interval from 60 to 100pc.This result is in disagreement with previous distance estimates to thesupposed supernova that has been suggested as responsible for clearingthe region from dust. As an alternative, the data presented support thesuggestion that the void may have been produced by the detachment ofmaterial from the interface between LoopI and the Local Bubble as aconsequence of hydromagnetic instabilities. Moreover, the distributionof colour excess as a function of distance supports a value of ~150pc asthe most probable distance to the dark cloud known as Lupus1.

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Observation and Astrometry data

Constellation:おおかみ座
Right ascension:15h26m02.26s
Declination:-30°06'14.8"
Apparent magnitude:9.723
Proper motion RA:13.2
Proper motion Dec:-11.6
B-T magnitude:10.613
V-T magnitude:9.797

Catalogs and designations:
Proper Names   (Edit)
TYCHO-2 2000TYC 7313-907-1
USNO-A2.0USNO-A2 0525-19375653
HIPHIP 75547

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