Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/LovelltagA1380tp.pdf Дата изменения: Thu Apr 7 05:01:00 2005 Дата индексирования: Sat Dec 22 22:32:21 2007 Кодировка: Поисковые слова: comet

Proposal Identification No.:

A1380

Date Received:

2005-Nov-11 01:21:21

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: ABSTRACT: Urgent Astronomy Spectroscopy Solar System approx. 25 Hours

Radio OH Observations of Comet C/1994 S4 LINEAR

In comets, a strong observed 18-cm OH line can b e pro duced as the comet amplifies or absorbs background radiation. In highly pro ductive comets, OH sp ectral lines in the inner coma app ear weaker than exp ected b ecause gas collisions thermalize and "quench" this maser emission. The role of such collisional quenching was recently shown to play a large role in Comet Hale-Bopp, one of the most pro ductive comets ever observed. The goal of this study is to achieve high-resolution observations of a less-pro ductive, more "typical" long-p erio d comet, in order to investigate the degree of quenching. The close apparition of the newly discovered comet C/1999 S4 LINEAR affords an opp ortunity to resolve the gas coma and observe how the OH lines vary with distance from the nucleus, constraining the degree of line quenching at work in the coma.

Name Amy J Lovell

Institution FCRAO/Amherst College

E-mail a jlovell@amherst.edu

Phone (413) 542-8479

Student no

None No All of the observing run. Part of the observing run. Queue Observing

Maybe Yes

Instrument Setup
L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
1612 1665-1667 1720 1