Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/2013Fall/LewistagA2804.pdf Дата изменения: Wed Mar 6 01:08:09 2013 Дата индексирования: Fri Feb 28 21:39:41 2014 Кодировка: Поисковые слова: http www.astronomy.ru forum index.php topic 4644.0.html

Proposal Identification No.:

A2804 Arecibo Observatory

Date Received: 2013-Feb-28 17:09:19 William E. Gordon Telescope Observing Time Request COVER SHEET

Section I - General Information
Submitted for Mar 1 2013. This proposal has been submitted before. The previous proposal number is A2804. Proposal Type: General Category: Sub-Category: Observation Category: Time Requested this semester: Hours Next Semester: Hours already used for this pro ject: Additional Hours required to complete pro ject: Minimum Useful Time: Expected Data Storage: Prop osal Title: ABSTRACT: Regular Astronomy Spectroscopy Galactic 3 hours 3 hours! 0 15 minutes less than 100 GB

To monitor the initiation of a jet in IRAS18455+0448

The mainline OH masers of IRAS18455+0448 have changed drastically since December 2010, with the eruption of strong new features well beyond its velocity range while it was still a normal OH/IR star. This star recently (in last 50 years) evolved into a proto planetary nebula (PPN), en route to its planetary nebula phase: it is possibly generating a jet now that is interacting with its circumstellar shell, which is the next development to expect from a PPN. This proposal seeks to monitor the development of this jet by monitoring its OH spectral lines. Outreach Abstract: Usually, the evolution of most celestial ob jects occurs on time scales much longer than a human lifetime. This proposal aims to study changes around a star that are occurring within a few years. Moreover many celestial sources, such as black holes and mass accreting neutron stars, develop bipolar high velocity jets. We suspect that this is currently occurring in the source we wish to monitor here. This can be done by looking at the changes over time in the masing lines from the OH molecule, which is well suited to the Arecibo telescope. This is a unique opportunity.

Name Brian M Lewis

Institution N/A

E-mail bmllewis@gmail.com

Phone 787 890 5010

Student no

This work is not part of a thesis.

1


Remote Observing Request

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

Section I I - Time Request
The following times are in LST. For these observations night-time is not needed.

Begin ­ End Interval­Interval 18:00 ­ 20:00 ­ ­ ­

Days Needed at This Interval 6

Time Constraints (Must Be Justified in the Prop osal Text) approximately every calendar month

Next Semester Time Request

Begin ­ End Interval­Interval 18:00 ­ 20:00 ­ ­ ­

Days Needed at This Interval 6

Time Constraints (Must Be Justified in the Prop osal Text) approximately every calendar month

Section I I I - Instruments Needed
2


L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

Section IV - RFI Considerations Frequency Ranges Planned
1612 - 1668 MHz

Section V - Observing List Target List
IRAS 18455+0448 18h 45m 33.9 s +04d48'06" (1950)

3