Resolved Hubble space spectroscopy of ultracool binary systems
Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of which belong to nine very low-mass binary systems with known angular separations in the range 0$\farcs...
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creator | Martín, E. L. Brandner, W. Bouy, H. Basri, G. Davis, J. Deshpande, R. Montgomery, M. M. |
description | Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of which belong to nine very low-mass binary systems with known angular separations in the range 0$\farcs$37–0$\farcs$098. For these dwarfs, we derive their spectral types to be in the range dM7.5 to dL6 by either obtaining their PC3 index value or by comparing our STIS spectra with ground-based spectra of similar spectral resolution from Martín et al. (1999b). We have searched for Hα emission in each object, but the emission is clearly detected in only two of them. We find that the distribution of Hα emission in our sample is statistically different from that of single field dwarfs, suggesting an intriguing anti-correlation between chromospheric activity and binarity for M7–M9.5 dwarfs. We provide strength measuments of the main photospheric features. We derive calibrations of spectral subclasses versus $\it F814W$ and K-band absolute magnitudes for a subset of 10 dwarfs in 5 binaries that have known trigonometric parallaxes. |
doi_str_mv | 10.1051/0004-6361:20054186 |
format | Article |
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L. ; Brandner, W. ; Bouy, H. ; Basri, G. ; Davis, J. ; Deshpande, R. ; Montgomery, M. M.</creator><creatorcontrib>Martín, E. L. ; Brandner, W. ; Bouy, H. ; Basri, G. ; Davis, J. ; Deshpande, R. ; Montgomery, M. M.</creatorcontrib><description>Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of which belong to nine very low-mass binary systems with known angular separations in the range 0$\farcs$37–0$\farcs$098. For these dwarfs, we derive their spectral types to be in the range dM7.5 to dL6 by either obtaining their PC3 index value or by comparing our STIS spectra with ground-based spectra of similar spectral resolution from Martín et al. (1999b). We have searched for Hα emission in each object, but the emission is clearly detected in only two of them. We find that the distribution of Hα emission in our sample is statistically different from that of single field dwarfs, suggesting an intriguing anti-correlation between chromospheric activity and binarity for M7–M9.5 dwarfs. We provide strength measuments of the main photospheric features. 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L.</creatorcontrib><creatorcontrib>Brandner, W.</creatorcontrib><creatorcontrib>Bouy, H.</creatorcontrib><creatorcontrib>Basri, G.</creatorcontrib><creatorcontrib>Davis, J.</creatorcontrib><creatorcontrib>Deshpande, R.</creatorcontrib><creatorcontrib>Montgomery, M. M.</creatorcontrib><title>Resolved Hubble space spectroscopy of ultracool binary systems</title><title>Astronomy and astrophysics (Berlin)</title><description>Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of which belong to nine very low-mass binary systems with known angular separations in the range 0$\farcs$37–0$\farcs$098. For these dwarfs, we derive their spectral types to be in the range dM7.5 to dL6 by either obtaining their PC3 index value or by comparing our STIS spectra with ground-based spectra of similar spectral resolution from Martín et al. (1999b). We have searched for Hα emission in each object, but the emission is clearly detected in only two of them. We find that the distribution of Hα emission in our sample is statistically different from that of single field dwarfs, suggesting an intriguing anti-correlation between chromospheric activity and binarity for M7–M9.5 dwarfs. We provide strength measuments of the main photospheric features. We derive calibrations of spectral subclasses versus $\it F814W$ and K-band absolute magnitudes for a subset of 10 dwarfs in 5 binaries that have known trigonometric parallaxes.</description><subject>Astronomy</subject><subject>brown dwarfs</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Galaxy: solar neighbourhood</subject><subject>stars: binaries: visual</subject><subject>stars: fundamental parameters</subject><subject>stars: late-type</subject><subject>stars: low-mass</subject><subject>techniques: spectroscopic</subject><issn>0004-6361</issn><issn>1432-0746</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNpFUE1LxDAUDKLguvoHPPWit-pL0iStB0EW1xUWRfEDvIQ0-wrV7KYmrbj_3pbV9fIejzczzAwhxxTOKAh6DgBZKrmkFwxAZDSXO2REM85SUJncJaMtYJ8cxPjen4zmfEQuHzF694WLZNaVpcMkNsYOE20bfLS-WSe-SjrXBmO9d0lZr0xYJ3EdW1zGQ7JXGRfx6HePyfP0-mkyS-f3N7eTq3lqeQFtmjOK0kIhMpASUUAlRcEXklNWKkZlYWVRZmWBaHKhUBqeGS4UE7gwVcE4H5PTjW4T_GeHsdXLOlp0zqzQd1Ez4Crr8_ZAtgHa3n0MWOkm1Mvesaagh6r00IQemtB_VfWkk191E61xVTArW8d_Zg5KqF59TNINru7Df2__JnxoqbgSOodXPXm7e2AvUOgp_wEdF3bB</recordid><startdate>20060901</startdate><enddate>20060901</enddate><creator>Martín, E. L.</creator><creator>Brandner, W.</creator><creator>Bouy, H.</creator><creator>Basri, G.</creator><creator>Davis, J.</creator><creator>Deshpande, R.</creator><creator>Montgomery, M. M.</creator><general>EDP Sciences</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20060901</creationdate><title>Resolved Hubble space spectroscopy of ultracool binary systems</title><author>Martín, E. L. ; Brandner, W. ; Bouy, H. ; Basri, G. ; Davis, J. ; Deshpande, R. ; Montgomery, M. 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M.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Martín, E. L.</au><au>Brandner, W.</au><au>Bouy, H.</au><au>Basri, G.</au><au>Davis, J.</au><au>Deshpande, R.</au><au>Montgomery, M. M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Resolved Hubble space spectroscopy of ultracool binary systems</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>2006-09-01</date><risdate>2006</risdate><volume>456</volume><issue>1</issue><spage>253</spage><epage>259</epage><pages>253-259</pages><issn>0004-6361</issn><eissn>1432-0746</eissn><coden>AAEJAF</coden><abstract>Using the low-resolution mode of the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope (HST), we obtain spectra from 20 spatially-resolved, ultracool dwarfs, eighteen of which belong to nine very low-mass binary systems with known angular separations in the range 0$\farcs$37–0$\farcs$098. For these dwarfs, we derive their spectral types to be in the range dM7.5 to dL6 by either obtaining their PC3 index value or by comparing our STIS spectra with ground-based spectra of similar spectral resolution from Martín et al. (1999b). We have searched for Hα emission in each object, but the emission is clearly detected in only two of them. We find that the distribution of Hα emission in our sample is statistically different from that of single field dwarfs, suggesting an intriguing anti-correlation between chromospheric activity and binarity for M7–M9.5 dwarfs. We provide strength measuments of the main photospheric features. We derive calibrations of spectral subclasses versus $\it F814W$ and K-band absolute magnitudes for a subset of 10 dwarfs in 5 binaries that have known trigonometric parallaxes.</abstract><cop>Les Ulis</cop><pub>EDP Sciences</pub><doi>10.1051/0004-6361:20054186</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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source | Bacon EDP Sciences France Licence nationale-ISTEX-PS-Journals-PFISTEX; EDP Sciences; EZB-FREE-00999 freely available EZB journals |
subjects | Astronomy brown dwarfs Earth, ocean, space Exact sciences and technology Galaxy: solar neighbourhood stars: binaries: visual stars: fundamental parameters stars: late-type stars: low-mass techniques: spectroscopic |
title | Resolved Hubble space spectroscopy of ultracool binary systems |
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