OHANA

Representative science objectives

Olivier Lai, Steve Ridgway, Jean Philippe Berger, Catherine Dougados, Vincent Coudé Du Foresto, Olivier Guyon, Régis Lachaume, Eugene Magnier, Fabien Malbet, François Ménard, Denis Mourard, Guy Perrin, Hélène Sol, Stephen Warren, Julien Woillez

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

In this poster, we examine the science potential of an 800 meter interferometer such as the OHANA Array. The working assumptions are a K=12 limiting magnitude, a 0.5 milliarcsecond resolution at K band, and a small (diffraction limit of individual telescope) field of view. The science cases described herein are by no means exhaustive and perhaps not even the ones that will eventually be carried out, but serve to illustrate the potential of the array. We expect that operation of the array will be proposal driven, so the actual science will come from the Mauna Kea communities. Our philosophy is that any measurement that can be made at a dedicated interferometer facility should not be a strong driver for OHANA. Therefore the science areas discussed in the poster focus on very high angular resolution measurements of faint sources. In some cases, science which can be addressed with simpler or dedicated facilities at an exploratory level can be carried to a significant new capability with OHANA. A limiting magnitude of 12 was obtained by simple computations, but first tests on the sky with the injection module (See adjacent poster on Phase I) will help narrow down this figure. At such sensitivity, Cepheid pulsations can be studied in considerable detail for a wide range of stellar parameters, leading to enhanced confidence in the accuracy of their use for distance measurement with minimal extrapolation or inferrence. The disk/star interaction zone in young stellar objects can be resolved with unprecedented detail for a range of masses and ages, providing direct information about the jet formation region, accretion rates and disk conditions. The broad line region of active galactic nuclei can be studied in a large number of sources of differing characteristics, testing specific models for AGN nuclear structure. For OHANA Phase III, a dual-star phase tracking capability is planned. With the resulting increased sensitivity, direct brown dwarf diameter measurement will provide a strong check on evolution models. Microlensing events could be resolved and provide unique new information about the lensing and the lensed objects.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsW.A. Traub
Pages1410-1423
Number of pages14
Volume4838
Edition2
DOIs
StatePublished - 2002
Externally publishedYes
EventInterferometry for Optical Astronomy II - Waikoloa, HI, United States
Duration: Aug 22 2002Aug 28 2002

Other

OtherInterferometry for Optical Astronomy II
CountryUnited States
CityWaikoloa, HI
Period8/22/028/28/02

Fingerprint

Interferometers
Stars
Distance measurement
Extrapolation
Telescopes
interferometers
stars
Diffraction
sensitivity
nuclear structure
extremely high frequencies
angular resolution
active galactic nuclei
Testing
field of view
sky
proposals
extrapolation
confidence
modules

Keywords

  • Brown dawrfs
  • Cepheids
  • Long baseline optical interferometry
  • Micro-lensing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Lai, O., Ridgway, S., Berger, J. P., Dougados, C., Du Foresto, V. C., Guyon, O., ... Woillez, J. (2002). OHANA: Representative science objectives. In W. A. Traub (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (2 ed., Vol. 4838, pp. 1410-1423) https://doi.org/10.1117/12.459376

OHANA : Representative science objectives. / Lai, Olivier; Ridgway, Steve; Berger, Jean Philippe; Dougados, Catherine; Du Foresto, Vincent Coudé; Guyon, Olivier; Lachaume, Régis; Magnier, Eugene; Malbet, Fabien; Ménard, François; Mourard, Denis; Perrin, Guy; Sol, Hélène; Warren, Stephen; Woillez, Julien.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / W.A. Traub. Vol. 4838 2. ed. 2002. p. 1410-1423.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lai, O, Ridgway, S, Berger, JP, Dougados, C, Du Foresto, VC, Guyon, O, Lachaume, R, Magnier, E, Malbet, F, Ménard, F, Mourard, D, Perrin, G, Sol, H, Warren, S & Woillez, J 2002, OHANA: Representative science objectives. in WA Traub (ed.), Proceedings of SPIE - The International Society for Optical Engineering. 2 edn, vol. 4838, pp. 1410-1423, Interferometry for Optical Astronomy II, Waikoloa, HI, United States, 8/22/02. https://doi.org/10.1117/12.459376
Lai O, Ridgway S, Berger JP, Dougados C, Du Foresto VC, Guyon O et al. OHANA: Representative science objectives. In Traub WA, editor, Proceedings of SPIE - The International Society for Optical Engineering. 2 ed. Vol. 4838. 2002. p. 1410-1423 https://doi.org/10.1117/12.459376
Lai, Olivier ; Ridgway, Steve ; Berger, Jean Philippe ; Dougados, Catherine ; Du Foresto, Vincent Coudé ; Guyon, Olivier ; Lachaume, Régis ; Magnier, Eugene ; Malbet, Fabien ; Ménard, François ; Mourard, Denis ; Perrin, Guy ; Sol, Hélène ; Warren, Stephen ; Woillez, Julien. / OHANA : Representative science objectives. Proceedings of SPIE - The International Society for Optical Engineering. editor / W.A. Traub. Vol. 4838 2. ed. 2002. pp. 1410-1423
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