Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/ArayatagA2933tp.pdf Дата изменения: Thu Sep 11 21:11:33 2014 Дата индексирования: Mon Apr 11 15:33:26 2016 Кодировка: Поисковые слова: universe

Proposal Identification No.:

A2933

Date Received:

2014-Sep-01 13:13:09

Technical Page
This proposal has not been submitted before. Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Stellar astrophysics: pre-PNe 4.5 Hours 1h

Hydroxyl Masers in the Prototypical Pre-Planetary Nebula CRL 618

Using the Arecibo Telescope, we detected 4765MHz excited OH emission (most likely a maser) toward the prototypical pre-Planetary Nebula (PPN) CRL618. This is the first detection of the 4765MHz OH transition in a late type stellar ob ject, and only one of a few excited OH transitions detected in Asymptotic Giant Branch (AGB) to Planetary Nebula ob jects. This detection is particularly interesting because CRL618 is a carbon-rich PPN where oxygen-based species are not expected, and the putative maser is highly blueshifted with respect to systemic velocity, which suggests that the emission is associated with the powerful molecular jets/outflows in the region. We propose to confirm this detection, and to observe all other OH transitions accessible with Arecibo to model the 4765MHz OH maser. Arecibo observations are needed because the lines will likely be weak and variable.

Name Esteban D. Araya

Institution Western Illinois University

E-mail ed-araya@wiu.edu

Phone 309 318 9134; 309 298 1359

Student no

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Instrument Setup
L-wide C X-band C-high

Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none 1


RFI Considerations Frequency Ranges Planned
NOTE: coordination with Punta Salinas and GPS L3 is desirable, but not critical for the scientific goals of the proposal.

OH transitions: ----------­ 1611 - 1613 1664 - 1666 1666 - 1668 1719 - 1721 4658 - 4662 4748 - 4752 4763 - 4767 6013 - 6019 6027 - 6033 6032 - 6038 6046 - 6052 7746 - 7752 7758 - 7764 7817 - 7823 7828 - 7834 8115 - 8121 8132 - 8138 8186 - 8192 8204 - 8211 8500 - 8506 8531 - 8537 8577 - 8583 8608 - 8614 Not critical for science goals: --------1266 - 1268 1293 - 1295 1419 - 1421 1627 - 1629 4495 - 4499 4616 - 4620 4742 - 4746 4827 - 4831 4872 - 4876 5624 - 5630 5777 - 5783 6275 - 6281 6665 - 6671 7322 - 7328 2


7340 - 7346 7345 - 7351 7984 - 7990

This proposal requires Iridium RFI protection at 1612 MHz between 10pm and 6am EST. This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

3