[email protected] Observational Astrophysics II: May-June, 20041 Observational Astrophysics Part II: Observations (5 p) May/June 2004: Rene´ Liseau Magnus

Observational Astrophysics II: May-June, 2004 [email protected]

Observational Astrophysics

Part II: Observations (5 p)

May/June 2004: Rene´ Liseau Magnus Gålfalk

http://www.astro.su.se/utbildning/kurser/astro_obs2/


LOGISTICSTravel Arrangements:

Bring your own clothes Bring the 5 laptops Meeting: after check in

(see itinary) Hotel: contact Ulla Engberg

Group Formation*: 2 persons per group1 proposal per group is o.k.But 1 report per person

*for ALFOSC Set-Up


GRP

NAME UT (Start/End)

Comment

1 Jeanette, Kristoffer

2 Andrej, Milan

3 Anna, Thomas

4 Sven

5

6


Writings

A. Observing Proposalhttp://www.not.iac.es/

-> Observing at NOT -> Applying for timei. Title

ii. Abstract iii. Scientific Rational & Immediate Objective (ugrads use Obs Programme)

iv. Justification of Requested Telescope Time & Lunar Phase v. List of Targets, inc. Standard / Calibration Sources vi. Observing Mode & Instrument Configuration vii. Finder Charts viii. Strategy for Data Reductions & Analysis (ugrads use IRAF)


Writings

B. Final Report

i. Title ii. Abstract iii. Introduction:(ugrads use Observational Programme from handouts)

(a) put project into general context(b) focus on particular project

iv. Observations (detailed description)

v. Data Reductions (detailed description)

vi. Results (results only – no discussion)

vii. Discussion & Conclusions (not mandatory for ugrads)

viii. References


HAND-OUTS1 Itinary (detailed)1 Goals of Course1 Observing Programme1 Source List1 Magnitudes & Photometry1 Time DefinitionsUser Guides:

1 TCS (Telescope Control System)

1 ALFOSC1 STANCAM1 NOTCam

1 Filters 1 NOT-FITS 1 IRAFExample of Exp Time Calc: 1 Exam


PREPARING the OBSERVATIONS

NOTMay 27 to 29: ALFOSC (3 nights / 30 hr)

long-slit spectroscopy

May 30 to 31: STANCam & NOTCam (2 nights / 20 hr)BVR & JHK imaging

SSTJune 2: Swedish Solar Telescope (1 day / 8-10 hr)

[Dan Kiselman]


PREPARING the OBSERVATIONS• Source Coordinates1. Needs Precession? http://fuse.pha.jhu.edu/support/tool/precess.html

2. Finder Charts [what is FOV of instrument?]3. When observable?

• Time of year• During the Night• What UT optimum? • Check the Moon

http://www.eso.org/observing/support.html

1. What type of Observation? (Spectroscopy / Imaging)• When & Which Calibration



Long-Slit Spectroscopy with ALFOSC• What spectral resolution ?

– What wavelengths– What grisms (pixel sampling)

– What filters– What slit widths (pixel sampling)

• What position angles ? (rotator)– Orientation & peak up / point sources (stars) ?

• Calibrators– Photometric Standard Stars I (Telluric Atmospheric Extinction)

– Photometric Standard Stars I I (Interstellar Extinction)

– Flux Calibrators– (in general: Wavelength Calibrators)



Long-Slit Spectroscopy with ALFOSC cntd

• What Quantum Efficiency ? (e.g., CCD#8)

http://www.not.iac.es/technical/astronomical/detectors/

• What Integration Time?http://www.eso.org/observing/support.html

-> Instrument Performance -> Exposure Time Calculator

• What Overheads ?Total Telescope Time Estimate (Requested in Proposal)



Imaging with STANCam & NOTCam

• What spatial resolution ?– Pixel sampling and seeing– What Field of View

• Calibrators– What Filters– Photometric Standard Stars I (Telluric Atmospheric Extinction)

– Photometric Standard Stars I I (Interstellar Extinction)

– Flux Calibrators– Whay Sky Background (La Palma)

http://www.not.iac.es/ -> Observing at NOT -> Applying for time


Astronomical Coordinates*

* Several systems in use; we focus here on two

Equatorial Coordinates (`Source Coordinates´)

Right Ascension: R.A. or (h m s) [0 to 24 hr]

Declination: Dec. or o ´ ´´) [-90o to +90o]

Fundametal plane: Earth’s Equatorial Plane

Zero Point: Vernal Equinox ()

Horizontal Coordinates (`Local Coordinates´)

Azimuth : Az (degrees) [0o to 360o] Elevation (or Height): El (degrees) [-90o to +90o]

Fundamental Plane: Local Horizontal PlaneZero Point: Northern Meridian


Astronomical Coordinates*

* Several systems in use; we focus here on two

Transformation Relations

latitude geographic theis and timesiderial theis

anglehour theiswhere

coscoscossinsinsin

coscossinsincoscoscos

sincossincos

ST

ST -t

AzElEl

AzElElt

AzElt

tEl

tAzEl

tAzEl

coscoscossinsinsin

coscossinsincoscoscos

sincossincos

:Inverse


Time

360 = 15 . 24 or 1 hr = 15o

at the equator

Siderial Time ST: (hour angle t of , Sun at equator S to N)

Universal Time UT: (previously Greenwich Mean Time GMT)

Julian Date JD: (zero point 4713 BC)


Documents

[email protected] Observational Astrophysics II: May-June, 20041 Observational Astrophysics Part II: Observations (5 p) May/June 2004: Rene´ Liseau Magnus