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HD 175176


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Rejection of the C-7 Diffuse Interstellar Band Hypothesis
Using the new high-resolution (~8 km s-1) echellespectrograph on the 3.5 m telescope at the Apache Point Observatory, wehave begun a high-sensitivity survey of the diffuse interstellar bands(DIBs) in a large sample of reddened stars. Now that we are 2 years intothis long-term survey, our sample includes over 20 reddened stars thatshow at least one of the DIBs that had been suggested to be caused byC-7, based on the gas-phase measurement of theC-7 spectrum by J. P. Maier's group. Thehigh-quality astronomical data from this larger sample of stars, alongwith the spectroscopic constants from the new laboratory work recentlyreported by Maier's group, have enabled us to examine more carefully theagreement between C-7 and the DIBs. We find thatnone of the C-7 bands match the DIBs in wavelengthor expected profile. One of the DIBs (λ5748) attributed toC-7 is actually a stellar line. The two strongestDIBs attributed to C-7 (λ6270 andλ4964) are not correlated in strength, so they cannot share thesame carrier. On the whole, we find no evidence supporting thehypothesis that C-7 is a carrier of the DIBs.

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Observation and Astrometry data

Constellation:Serpens
Right ascension:18h53m58.85s
Declination:+06°00'51.7"
Apparent magnitude:8.745
Distance:406.504 parsecs
Proper motion RA:12.1
Proper motion Dec:-2.7
B-T magnitude:11.099
V-T magnitude:8.94

Catalogs and designations:
Proper Names
HD 1989HD 175176
TYCHO-2 2000TYC 461-378-1
USNO-A2.0USNO-A2 0900-13681941
HIPHIP 92743

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