<mets:mets OBJID="eprint_144155" LABEL="Eprints Item" xsi:schemaLocation="http://www.loc.gov/METS/ http://www.loc.gov/standards/mets/mets.xsd http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-3.xsd" xmlns:mets="http://www.loc.gov/METS/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><mets:metsHdr CREATEDATE="2026-06-18T14:05:37Z"><mets:agent ROLE="CUSTODIAN" TYPE="ORGANIZATION"><mets:name>ePrints Soton</mets:name></mets:agent></mets:metsHdr><mets:dmdSec ID="DMD_eprint_144155_mods"><mets:mdWrap MDTYPE="MODS"><mets:xmlData><mods:titleInfo><mods:title>The structure of the outer galactic disc as revealed by IPHAS early A stars</mods:title></mods:titleInfo><mods:name type="personal"><mods:namePart type="given">S. E.</mods:namePart><mods:namePart type="family">Sale</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">J. E.</mods:namePart><mods:namePart type="family">Drew</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">C.</mods:namePart><mods:namePart type="family">Knigge</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">A. A.</mods:namePart><mods:namePart type="family">Zijlstra</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">M. J.</mods:namePart><mods:namePart type="family">Irwin</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">R. A. H.</mods:namePart><mods:namePart type="family">Morris</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">S.</mods:namePart><mods:namePart type="family">Phillipps</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">J. J.</mods:namePart><mods:namePart type="family">Drake</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">R.</mods:namePart><mods:namePart type="family">Greimel</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">Y. C.</mods:namePart><mods:namePart type="family">Unruh</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">P. J.</mods:namePart><mods:namePart type="family">Groot</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">A.</mods:namePart><mods:namePart type="family">Mampaso</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart type="given">N. A.</mods:namePart><mods:namePart type="family">Walton</mods:namePart><mods:role><mods:roleTerm type="text">author</mods:roleTerm></mods:role></mods:name><mods:abstract>This study is an investigation of the stellar density profile of the Galactic disc in the anticentre direction. We select over 40?000 early A stars from INT/WFC Photometric H? Survey of the Northern Galactic Plane (IPHAS) photometry in the Galactic longitude range 160° &amp;lt; l &amp;lt; 200° close to the equatorial plane (?1° &amp;lt; b &amp;lt; +1°) . &lt;br/&gt;&lt;br/&gt;We then compare their observed reddening-corrected apparent magnitude distribution with simulated photometry obtained from parametrized models in order to set constraints on the anticentre stellar density profile. By selecting A stars, we are appraising the properties of a population only ?100 Myr old. &lt;br/&gt;&lt;br/&gt;We find that the stellar density profile of young stars is well fit to an exponential with length-scale of (3020 ± 120statistical± 180systematic) pc , which is comparable to that obtained in earlier studies, out to a Galactocentric radius of RT= (13.0 ± 0.5statistical± 0.6systematic) kpc . At larger radii, the rate of decline appears to increase with the scalelength dropping to (1200 ± 300statistical± 70systematic) pc. &lt;br/&gt;&lt;br/&gt;This result amounts to a refinement of the conclusions reached in previous studies that the stellar density profile is abruptly truncated. The IPHAS A star data are not compatible with models that propose a sudden change in metallicity at RG= 10 kpc .</mods:abstract><mods:originInfo><mods:dateIssued encoding="iso8061">2010-02</mods:dateIssued></mods:originInfo><mods:genre>Article</mods:genre></mets:xmlData></mets:mdWrap></mets:dmdSec><mets:amdSec ID="TMD_eprint_144155"><mets:rightsMD ID="rights_eprint_144155_mods"><mets:mdWrap MDTYPE="MODS"><mets:xmlData><mods:useAndReproduction><p xmlns="http://www.w3.org/1999/xhtml"><strong>For work being deposited by its own author or their nominees in the public archive:</strong> In self-archiving this item/collection of files and associated bibliographic metadata, I grant e-Prints Soton the right to store them, to make them available online without charge in accordance with the access setting selected and after the expiry of any embargo period stipulated to make them available publicly. I declare that any errors or omissions in the content of these items are the responsibility of the author and that I have exercised reasonable care to ensure that there is no infringement of anyone's copyright or moral rights. Where necessary, co-authors have agreed that these items can be deposited in relevant repositories. I also confirm that all necessary permissions to publish have been obtained from any third party sponsor or collaborator, particularly in relation to that third party's confidential information and that I have selected the appropriate access setting or embargo period thereby ensuring compliance with any contractual or confidentiality obligation applicable to my work. I understand that if there is notification of any breach of copyright in distributing these files or metadata that the e-Prints Steering Group will consult with the author in the first instance in line with the e-Prints Soton Takedown Policy and take immediate action as appropriate. All authors are urged to prominently assert their copyright, where applicable, on the title page of their work.</p> <p xmlns="http://www.w3.org/1999/xhtml"><strong>For work being deposited by someone other than its author or their nominees in the public archive:</strong> I hereby declare that the collection of files and associated bibliographic metadata that I am archiving at e-Prints Soton is in the public domain. If this is not the case, I accept the same responsibilities as the author for any breach of copyright, contract or confidentiality that distributing these files or metadata may entail. Clicking on the deposit button indicates your agreement to these terms. </p></mods:useAndReproduction></mets:xmlData></mets:mdWrap></mets:rightsMD></mets:amdSec><mets:fileSec></mets:fileSec><mets:structMap><mets:div DMDID="DMD_eprint_144155_mods" ADMID="TMD_eprint_144155"></mets:div></mets:structMap></mets:mets>