Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/ArayatagA2933tp.ps Дата изменения: Thu Sep 11 21:11:32 2014 Дата индексирования: Mon Apr 11 14:55:14 2016 Кодировка: Поисковые слова: planetary nebula

Proposal Identication No.: A2933 Date Received: 2014-Sep-01 13:13:09
Technical Page
This proposal has not been submitted before.
Proposal Type: Regular
General Category: Astronomy
Sub-Category: Spectroscopy
Observation Category: Stellar astrophysics: pre-PNe
Total Time Requested: 4.5 Hours
Minimum Useful Time: 1h
Proposal Title: Hydroxyl Masers in the Prototypical Pre-Planetary Nebula CRL 618
ABSTRACT:
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 rst detection of the 4765MHz OH transition in a
late type stellar object, and only one of a few excited OH transitions detected in Asymptotic Giant Branch (AGB)
to Planetary Nebula objects. 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/out ows in the region. We
propose to conrm 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 Institution E-mail Phone Student
Esteban D. Araya Western Illinois Uni-
versity
ed-araya@wiu.edu 309 318 9134;
309 298 1359
no
Remote Observing Request
Observer will travel to AO
X Remote Observing
In Absentia (instructions to oper-
ator)
Instrument Setup
L-wide C X-band C-high
Atmospheric Observation Instruments:
Special 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 scientic 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